# Cornigamasus pseudocliferius n. sp., new species of mite from China based on adults and deutonymphs (Parasitiformes: Parasitidae)

Mao-Yuan Yao, Jian-Xin Chen, Tian-Ci Yi, Dao-Chao Jin

► To cite this version:

Mao-Yuan Yao, Jian-Xin Chen, Tian-Ci Yi, Dao-Chao Jin. Cornigamasus pseudocliferius n. sp., new species of mite from China based on adults and deutonymphs (Parasitiformes: Parasitidae). *Acarologia*, 2024, 64 (2), pp.626-636. 10.24349/de1v-8oni. hal-04582926

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Submitted on 22 May 2024

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Distributed under a Creative Commons Attribution 4.0 International License
# Cornigamasus pseudocliferius n. sp., new species of mite from China based on adults and deutonymphs (Parasitiformes: Parasitidae)

Mao-Yuan Yao, Jian-Xin Chen, Tian-Ci Yi, Dao-Chao Jin

► To cite this version:

Mao-Yuan Yao, Jian-Xin Chen, Tian-Ci Yi, Dao-Chao Jin. Cornigamasus pseudocliferius n. sp., new species of mite from China based on adults and deutonymphs (Parasitiformes: Parasitidae). *Acarologia*, 2024, 64 (2), pp.626-636. 10.24349/de1v-8oni. hal-04582926

HAL Id: hal-04582926

https://hal.science/hal-04582926v1

Submitted on 22 May 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
*Cornigamasus pseudocliferius* n. sp.,
new species of mite from China based
on adults and deutonymphs
(Parasitiformes: Parasitidae)

Mao-Yuan Yao IDª, Jian-Xin Chen IDª, Tian-Ci Yi IDᵇ, Dao-Chao Jin IDᵇ

**Original research**

**ABSTRACT**

A new species, *Cornigamasus pseudocliferius* Yao & Jin **n. sp.**, is described based on deutonymph and adult specimens, collected from the nest of *Oryctolagus cuniculus* (L.) and cow dung in China. An identification key to the known species of *Cornigamasus* in China is provided.

**Keywords** description; *Cornigamasus*; new species; China

**Zoobank** http://zoobank.org/967B30E3-1B7F-4C8D-886F-84580404E703

**Introduction**

Mites of the family Parasitidae are common and geographically widespread predators of small invertebrates and their eggs. They live in forest soil, compost, manure, shore litter, and mammal and insect nests (Hyatt 1980). Parasitidae comprises 46 genera in two subfamilies, Parasitinae Oudemans, 1901 and Pergamasinae Juvara-Bals, 1972 (Hrúzová & Fendá 2018; Makarova 2019; Juvara-Bals 2019; Yao *et al.* 2020a). The genus *Cornigamasus*, belonging to the subfamily Parasitinae Oudemans, was erected by Evans & Till (1979) with *Gamasus coleoptratorum* var. *lunaris* Berlese, 1882 as its type species. It is easily separated from other genera of Parasitinae by long corniculi extending beyond the anterior margin of the palp trochanter. Nine species of *Cornigamasus* have been described worldwide (Yao *et al.* 2020b), three species of which occur in China – *Cornigamasus allotritosternus* Yao, Guo, Yi & Jin 2020, *C. lunaris* Berlese, 1882 and *C. oulaensis* Ma, 1986 (Ma 1986; 2005; Gu *et al.* 1987; Ma & Bai 2017; Yao *et al.* 2020b). We here describe a new species of *Cornigamasus* based on deutonymph and adult specimens.

**Material and methods**

Species were extracted from the nest of *Oryctolagus cuniculus* (L.) and cow dung by Tullgren funnels for 12–24 hours, and collected into 75% alcohol. Mites were cleared in Nesbitt's solution and then mounted on slides in Hoyer's medium. Specimens were observed and illustrated under a Nikon DS-Ri2 microscope, and figures were edited with Adobe Photoshop CC2021. The measuring follows Yao *et al.* (2020b), and all measurements are given in micrometers (μm).

The system of idiosomal setal nomenclature follows Hyatt (1980). Terminology for the leg chaetotaxy follows Evans (1963a), palp chaetotaxy follows Evans (1963b) and adenotaxy and poroidotaxy follows Athias-Henriot (1971, 1975).

<figure><img src="image_2.png" /></figure>

<footnote>ª College of Agriculture, Anshun University, Anshun, 561000, P. R. China.</footnote>

<footnote>ᵇ Institute of Entomology, Guizhou University, and Guizhou Provincial Key Laboratory for Plant Pest Management of Mountainous Region, Guiyang 550025, P. R. China.</footnote>
*Cornigamasus pseudocliferius* n. sp.,
new species of mite from China based
on adults and deutonymphs
(Parasitiformes: Parasitidae)

Mao-Yuan Yao IDª, Jian-Xin Chen IDª, Tian-Ci Yi IDᵇ, Dao-Chao Jin IDᵇ

Original research

ABSTRACT

A new species, *Cornigamasus pseudocliferius* Yao & Jin **n. sp.**, is described based on deutonymph and adult specimens, collected from the nest of *Oryctolagus cuniculus* (L.) and cow dung in China. An identification key to the known species of *Cornigamasus* in China is provided.

**Keywords** description; *Cornigamasus*; new species; China

**Zoobank** http://zoobank.org/967B30E3-1B7F-4C8D-886F-84580404E703

**Introduction**

Mites of the family Parasitidae are common and geographically widespread predators of small invertebrates and their eggs. They live in forest soil, compost, manure, shore litter, and mammal and insect nests (Hyatt 1980). Parasitidae comprises 46 genera in two subfamilies, Parasitinae Oudemans, 1901 and Pergamasinae Juvara-Bals, 1972 (Hrúzová & Fendá 2018; Makarova 2019; Juvara-Bals 2019; Yao *et al.* 2020a). The genus *Cornigamasus*, belonging to the subfamily Parasitinae Oudemans, was erected by Evans & Till (1979) with *Gamasus coleoptratorum* var. *lunaris* Berlese, 1882 as its type species. It is easily separated from other genera of Parasitinae by long corniculi extending beyond the anterior margin of the palp trochanter. Nine species of *Cornigamasus* have been described worldwide (Yao *et al.* 2020b), three species of which occur in China – *Cornigamasus allotritosternus* Yao, Guo, Yi & Jin 2020, *C. lunaris* Berlese, 1882 and *C. oulaensis* Ma, 1986 (Ma 1986; 2005; Gu *et al.* 1987; Ma & Bai 2017; Yao *et al.* 2020b). We here describe a new species of *Cornigamasus* based on deutonymph and adult specimens.

**Material and methods**

Species were extracted from the nest of *Oryctolagus cuniculus* (L.) and cow dung by Tullgren funnels for 12–24 hours, and collected into 75% alcohol. Mites were cleared in Nesbitt's solution and then mounted on slides in Hoyer's medium. Specimens were observed and illustrated under a Nikon DS-Ri2 microscope, and figures were edited with Adobe Photoshop CC2021. The measuring follows Yao *et al.* (2020b), and all measurements are given in micrometers (μm).

The system of idiosomal setal nomenclature follows Hyatt (1980). Terminology for the leg chaetotaxy follows Evans (1963a), palp chaetotaxy follows Evans (1963b) and adenotaxy and poroidotaxy follows Athias-Henriot (1971, 1975).

<figure><img src="image_2.png" /></figure>

<footnote>ª College of Agriculture, Anshun University, Anshun, 561000, P. R. China.</footnote>

<footnote>ᵇ Institute of Entomology, Guizhou University, and Guizhou Provincial Key Laboratory for Plant Pest Management of Mountainous Region, Guiyang 550025, P. R. China.</footnote>
# Results

## Family Parasitidae Oudemans, 1901

## Subfamily Parasitinae Oudemans, 1901

## Genus Cornigamasus Evans & Till, 1979

Type species: *Gamasus coleoptratorum* var. *lunaris* Berlese, 1882

Diagnosis of genus. The diagnosis of *Cornigamasus* used here is based on that of Yao *et al.* 2020b.

**Cornigamasus pseudocliferius** Yao & Jin *n. sp.*

Zoobank: A412A76E-1180-4243-9A2B-56ECDC75564E

### Material examined

**Holotype** — ♀ (slide no. AH-Cor.-F2018052401), encountered in the nest of *Oryctolagus cuniculus* (L.), Huangshan (170 m a.s.l., N 29°49'20", E 118°16'1"), Anhui Province, China, May 24, 2018.

**Paratypes** — 4 ♀♀ (AH-Cor.-F2018052402–AH-Cor.-F2018052405) and six deutonymphs (AH-Cor.-DN2018052401–AH-Cor.-DN2018052406) same collection data as the holotype; 9 ♀♀ (GZ-Cor.-F2018031001–GZ-Cor.-F2018031009), 6 ♂♂ (GZ-Cor.-M2018031001–GZ-Cor.-M2018031006) and ten deutonymphs (GZ-Cor.-DN2018031001–GZ-Cor.-DN2018031010) encountered in cow dung, Huishui (343 m a.s.l., N 29°15'5", E 118°5'6"), Guizhou Province, China, Mar. 10, 2018.

**Material deposition** — All specimens are deposited in the Institute of Entomology, Guizhou University, Guiyang, China (GUGC).

### Diagnosis

**Adult female and male** — Both sexes moderately sclerotized; dorsal and ventral shields without reticulation; setae *j3* distally pilose; tarsus I without ambulacrum. In the female, podonotal and opisthonotal shields bearing 20 and nine pairs of setae respectively; membranous cuticle of opisthosoma with eight pairs of setae distally pilose; opisthogastric shield bearing six pairs of setae, *JV4* distally pilose. In the male, opisthonotal region with three pairs of setae distally pilose (*Z1*, *Z3* and a pair of setae located on posterior edge); opisthogastric region with 13 pairs of setae, of which two pairs (*JV4* and *JV5*) distally pilose; femur II with a main spur and axillary process, genu II with a spur.

**Deutonymph** — Idiosoma weakly sclerotized. Dorsal shields without reticulation. podonotal and opisthonotal shields bearing 18 and nine pairs of setae, respectively; *s6* off shield; opisthogastric region bearing 15 pairs of setae. All dorsal and ventral setae smooth.

### Description

**Female** — (n=14) (Figures 1–2)

*Dorsal idiosoma* (Figure 1A). Idiosoma moderately sclerotized, length 846–991, width 560–589, oval in outline and yellowish or brown in color. Dorsal shields without reticulation; Posterior margin of podonotal shield convex, fitted closely with concave anterior margin of opisthonotal shield. Podonotal shield, length 418–446, width 444–475, bearing 20 pairs of setae, which of *j1*, *j3*, *j4*, *z5* and *r3* thickened and distally pilose. Setae *r2* (16–18), *r4* (16–18) and *r6* (14–16) off shield. Podonotal shield distinctly broader than opisthonotal one, length 215–241, width 232–258. Opisthonotal shield bearing nine pairs of setae, of which *Z1* and *Z3* thickened and distally pilose. Membranous cuticle of opisthosoma with 11–12 pairs of setae, of which eight pairs thickened and distally pilose. Lengths of dorsal setae on the shields: *j1* 36–39, *j2* 14–16, *j3* 39–42, *j4* 39–43, *j5* 14–16, *j6* 140–15, *z1* 18–20, *z2* 12–14, *z3* 12–14, *z4* 12–15, *z5* 40–44, *z6* 13–15, *s1* 15–17, *s2* 12–14, *s3* 13–14, *s4* 12–14, *s6* 13–15, *r3* 68–72, *r5*
# Results

## Family Parasitidae Oudemans, 1901

## Subfamily Parasitinae Oudemans, 1901

## Genus Cornigamasus Evans & Till, 1979

Type species: *Gamasus coleoptratorum* var. *lunaris* Berlese, 1882

Diagnosis of genus. The diagnosis of *Cornigamasus* used here is based on that of Yao *et al.* 2020b.

**Cornigamasus pseudocliferius** Yao & Jin *n. sp.*

Zoobank: A412A76E-1180-4243-9A2B-56ECDC75564E

## Material examined

**Holotype** — ♀ (slide no. AH-Cor.-F2018052401), encountered in the nest of *Oryctolagus cuniculus* (L.), Huangshan (170 m a.s.l., N 29°49'20", E 118°16'1"), Anhui Province, China, May 24, 2018.

**Paratypes** — 4 ♀♀ (AH-Cor.-F2018052402–AH-Cor.-F2018052405) and six deutonymphs (AH-Cor.-DN2018052401–AH-Cor.-DN2018052406) same collection data as the holotype; 9 ♀♀ (GZ-Cor.-F2018031001–GZ-Cor.-F2018031009), 6 ♂♂ (GZ-Cor.-M2018031001–GZ-Cor.-M2018031006) and ten deutonymphs (GZ-Cor.-DN2018031001–GZ-Cor.-DN2018031010) encountered in cow dung, Huishui (343 m a.s.l., N 29°15'5", E 118°5'6"), Guizhou Province, China, Mar. 10, 2018.

**Material deposition** — All specimens are deposited in the Institute of Entomology, Guizhou University, Guiyang, China (GUGC).

## Diagnosis

**Adult female and male** — Both sexes moderately sclerotized; dorsal and ventral shields without reticulation; setae *j3* distally pilose; tarsus I without ambulacrum. In the female, podonotal and opisthonotal shields bearing 20 and nine pairs of setae respectively; membranous cuticle of opisthosoma with eight pairs of setae distally pilose; opisthogastric shield bearing six pairs of setae, *JV4* distally pilose. In the male, opisthonotal region with three pairs of setae distally pilose (*Z1*, *Z3* and a pair of setae located on posterior edge); opisthogastric region with 13 pairs of setae, of which two pairs (*JV4* and *JV5*) distally pilose; femur II with a main spur and axillary process, genu II with a spur.

**Deutonymph** — Idiosoma weakly sclerotized. Dorsal shields without reticulation. podonotal and opisthonotal shields bearing 18 and nine pairs of setae, respectively; *s6* off shield; opisthogastric region bearing 15 pairs of setae. All dorsal and ventral setae smooth.

## Description

**Female** — (n=14) (Figures 1–2)

*Dorsal idiosoma* (Figure 1A). Idiosoma moderately sclerotized, length 846–991, width 560–589, oval in outline and yellowish or brown in color. Dorsal shields without reticulation; Posterior margin of podonotal shield convex, fitted closely with concave anterior margin of opisthonotal shield. Podonotal shield, length 418–446, width 444–475, bearing 20 pairs of setae, which of *j1*, *j3*, *j4*, *z5* and *r3* thickened and distally pilose. Setae *r2* (16–18), *r4* (16–18) and *r6* (14–16) off shield. Podonotal shield distinctly broader than opisthonotal one, length 215–241, width 232–258. Opisthonotal shield bearing nine pairs of setae, of which *Z1* and *Z3* thickened and distally pilose. Membranous cuticle of opisthosoma with 11–12 pairs of setae, of which eight pairs thickened and distally pilose. Lengths of dorsal setae on the shields: *j1* 36–39, *j2* 14–16, *j3* 39–42, *j4* 39–43, *j5* 14–16, *j6* 140–15, *z1* 18–20, *z2* 12–14, *z3* 12–14, *z4* 12–15, *z5* 40–44, *z6* 13–15, *s1* 15–17, *s2* 12–14, *s3* 13–14, *s4* 12–14, *s6* 13–15, *r3* 68–72, *r5*
<figure><img src="image_3.png" /><figcaption>**Figure 1** *Cornigamasus pseudocliferius* n. sp., female. A – Dorsum; B – Venter; C – Endogynium; D – Gnathotectum; E – Trochanter, femur and genu of palp; F – Subcapitulum; G – Chelicera.</figcaption></figure>
<figure><img src="image_3.png" /><figcaption>**Figure 1** *Cornigamasus pseudocliferius* n. sp., female. A – Dorsum; B – Venter; C – Endogynium; D – Gnathotectum; E – Trochanter, femur and genu of palp; F – Subcapitulum; G – Chelicera.</figcaption></figure>
<figure><img src="image_4.png" /><figcaption>**Figure 2** *Cornigamasus pseudocliberius* n. sp., female. A – Leg I; B – Leg II; C – Leg III; D – Leg IV.</figcaption></figure>
<figure><img src="image_4.png" /><figcaption>**Figure 2** *Cornigamasus pseudocliberius* n. sp., female. A – Leg I; B – Leg II; C – Leg III; D – Leg IV.</figcaption></figure>
14–16, *J1* 15–18, *J2* 16–17, *J3* 15–17, *Z1* 51–54, *Z2* 15–17, *Z3* 58–66, *Z4* 14–16, *S1* 14–15, *S2* 16–18.

*Ventral idiosoma* (Figure 1B). Tritosternum with pilose laciniae, length 88–108, base length 49–56, flanked by two pairs of presternal platelets close to each other, of which postero-medial pair clearly larger than anterior pair. Sternal shield with two pairs of poroids (*iv1–iv2*) and three pairs of setae (*st1–st3*), setae *st2* slightly thicker and shorter than *st1* and *st3*. Posterior margin of sternal shield deeply notched. Metasternal shield clearly detached from sternal shield and genital shield. Epigynium with anterior half narrow and pointed, posteriorly separated from opisthogastric shield, glands *gv2* with three openings. Endogynium (Figure 1C), length 107–129, width 75–92, comprised of oval-like structures and with a protruding posterior lamella. Opisthogastric shield bearing six pairs of setae and three circum-anal setae. Seta *JV4* distally pilose, others smooth. Opisthogastric soft cuticle with seven pairs of setae, of which four pairs distally pilose. Peritreme, length 387–418, extending anteriorly to the level of coxa I. Lengths of ventral setae on the shields: *st1* 49–52, *st2* 35–37, *st3* 47–50, *st4* 25–27, *st5* 29–31, *JV1* 30–33, *JV2* 34–37, *JV3* 39–41, *JV4* 50–52, *ZV1* 22–24, *ZV2* 32–34, *po* 18–20, *pa* 14–16.

*Gnathosoma*. Gnathotectum (Figure 1D) with one prong, distal end of prong round or truncate, emerging from denticulate base. Palp length 226–254, trochanter bearing setae *v1* and *v2*, *v2* pilose distally and set on tubercle; femur with five setae (*al*, *d1*, *d2*, *d3* and *pl*), of which *al* spiculate distally; genu with six pairs of setae (*all*, *al2*, *d1*, *d2*, *d3* and *pl*), of which *all* and *al2* spatulate distally. Trochanter, femur and genu of palp as in Figure 1E. Corniculus (106–138), long, slender and reaching midpoint of palp femur; deutosternal groove with 10–11 denticulate rows; seta *h1* (68–72), *h2* (38–42), *h3* (96–112) and *pcx* (46–53) smooth (Figure 1F). Fixed digit of chelicera with four teeth, movable digit bearing four teeth (Figure 1G).

*Legs* (Figure 2). Lengths of legs I–IV: 685–756, 556–580, 470–514, 672–723 respectively. Tarsus I without ambulacrum, with seven clavate sensory setae, shorter than tactile setae. Coxa I and trochanter I with apophysis at anterolateral side. Setae *av1*, *all1*, *pv1* and *pl1* on tarsi II–IV modified to short and thick spurs. Most leg setae acuminate and smooth.

**Male** — (n=6) (Figure 3)

*Dorsal idiosoma* (Figure 3A). Idiosoma length 646–788, width 424–571, shape and colour as in female. Holodorsal shield covering entire dorsum, with a suture closely anterior to setae *Z1*. Setae *j1* (33–35), *j3* (32–34), *j4* (32–34), *z5* (36–39), *r3* (46–50), *Z1* (38–40), *Z3* (40–41) and a pair of setae (62–65) located on posterior edge thickened and pilose distally as in female, all other setae short and smooth.

*Ventral idiosoma* (Figure 3B). Tritosternum absent. Genital opening flanked by two pairs of presternal platelets, posterior one quadrilateral and evidently larger than anterolateral one, which is sometimes fragmented into two platelets. Sternogenital shield bearing five pairs of smooth setae (*st1–st5*), of which *st4* (22–24) shorter than others, *st1–st3* and *st5* subequal in length (27–31), and three pairs of poroids. Posterior margin of sternogenital shield separated from opisthogastric region by a transverse suture. Opisthogastric region with 13 pairs of setae, of which *JV4* (39–43) and *JV5* (42–43) stout and pilose distally. Setae *pa* (17–18) longer than *po* (12–15). Peritreme length 317–436.

*Gnathosoma*. Palp length 188–265, trochanter, femur and genu as in Figure 3C. Fixed digit of chelicera with three teeth, movable digit with a denticulated tooth (Figure 3D). Central prong of gnathotectum (Figure 3E). Lengths of setae: *h1* 65–69, *h2* 17–20, *h3* 68–72, *pcx* 29–32 (Figure 3F). Other characteristics as in female.

*Legs*. Lengths of legs I–IV: 610–706, 479–521, 437–494, 597–698 respectively. Leg II obviously stouter than others. Femur II with a main spur (proximal) and an axillary process (distally), genu II and tibia II with a spur (Figure 3G). Other characteristics as in female.

**Deutonymph** (n=16) (Figures 4, 5)

*Dorsal idiosoma* (Figure 4A). Idiosoma weakly sclerotized, usually yellowish or tawny in color, length 569–628, width 404–436. Podonotal and opistonotal shields distinct and without reticulation. Posterior margin of podonotal shield (length 339–363 and width 328–367) convex, fitted closely into concave anterior margin of opistonotal shield (length 130–152 and width
14–16, *J1* 15–18, *J2* 16–17, *J3* 15–17, *Z1* 51–54, *Z2* 15–17, *Z3* 58–66, *Z4* 14–16, *S1* 14–15, *S2* 16–18.

*Ventral idiosoma* (Figure 1B). Tritosternum with pilose laciniae, length 88–108, base length 49–56, flanked by two pairs of presternal platelets close to each other, of which postero-medial pair clearly larger than anterior pair. Sternal shield with two pairs of poroids (*iv1–iv2*) and three pairs of setae (*st1–st3*), setae *st2* slightly thicker and shorter than *st1* and *st3*. Posterior margin of sternal shield deeply notched. Metasternal shield clearly detached from sternal shield and genital shield. Epigynium with anterior half narrow and pointed, posteriorly separated from opisthogastric shield, glands *gv2* with three openings. Endogynium (Figure 1C), length 107–129, width 75–92, comprised of oval-like structures and with a protruding posterior lamella. Opisthogastric shield bearing six pairs of setae and three circum-anal setae. Seta *JV4* distally pilose, others smooth. Opisthogastric soft cuticle with seven pairs of setae, of which four pairs distally pilose. Peritreme, length 387–418, extending anteriorly to the level of coxa I. Lengths of ventral setae on the shields: *st1* 49–52, *st2* 35–37, *st3* 47–50, *st4* 25–27, *st5* 29–31, *JV1* 30–33, *JV2* 34–37, *JV3* 39–41, *JV4* 50–52, *ZV1* 22–24, *ZV2* 32–34, *po* 18–20, *pa* 14–16.

*Gnathosoma*. Gnathotectum (Figure 1D) with one prong, distal end of prong round or truncate, emerging from denticulate base. Palp length 226–254, trochanter bearing setae *v1* and *v2*, *v2* pilose distally and set on tubercle; femur with five setae (*al*, *d1*, *d2*, *d3* and *pl*), of which *al* spiculate distally; genu with six pairs of setae (*all*, *al2*, *d1*, *d2*, *d3* and *pl*), of which *all* and *al2* spatulate distally. Trochanter, femur and genu of palp as in Figure 1E. Corniculus (106–138), long, slender and reaching midpoint of palp femur; deutosternal groove with 10–11 denticulate rows; seta *h1* (68–72), *h2* (38–42), *h3* (96–112) and *pcx* (46–53) smooth (Figure 1F). Fixed digit of chelicera with four teeth, movable digit bearing four teeth (Figure 1G).

*Legs* (Figure 2). Lengths of legs I–IV: 685–756, 556–580, 470–514, 672–723 respectively. Tarsus I without ambulacrum, with seven clavate sensory setae, shorter than tactile setae. Coxa I and trochanter I with apophysis at anterolateral side. Setae *av1*, *all1*, *pv1* and *pl1* on tarsi II–IV modified to short and thick spurs. Most leg setae acuminate and smooth.

**Male** — (n=6) (Figure 3)

*Dorsal idiosoma* (Figure 3A). Idiosoma length 646–788, width 424–571, shape and colour as in female. Holodorsal shield covering entire dorsum, with a suture closely anterior to setae *Z1*. Setae *j1* (33–35), *j3* (32–34), *j4* (32–34), *z5* (36–39), *r3* (46–50), *Z1* (38–40), *Z3* (40–41) and a pair of setae (62–65) located on posterior edge thickened and pilose distally as in female, all other setae short and smooth.

*Ventral idiosoma* (Figure 3B). Tritosternum absent. Genital opening flanked by two pairs of presternal platelets, posterior one quadrilateral and evidently larger than anterolateral one, which is sometimes fragmented into two platelets. Sternogenital shield bearing five pairs of smooth setae (*st1–st5*), of which *st4* (22–24) shorter than others, *st1–st3* and *st5* subequal in length (27–31), and three pairs of poroids. Posterior margin of sternogenital shield separated from opisthogastric region by a transverse suture. Opisthogastric region with 13 pairs of setae, of which *JV4* (39–43) and *JV5* (42–43) stout and pilose distally. Setae *pa* (17–18) longer than *po* (12–15). Peritreme length 317–436.

*Gnathosoma*. Palp length 188–265, trochanter, femur and genu as in Figure 3C. Fixed digit of chelicera with three teeth, movable digit with a denticulated tooth (Figure 3D). Central prong of gnathotectum (Figure 3E). Lengths of setae: *h1* 65–69, *h2* 17–20, *h3* 68–72, *pcx* 29–32 (Figure 3F). Other characteristics as in female.

*Legs*. Lengths of legs I–IV: 610–706, 479–521, 437–494, 597–698 respectively. Leg II obviously stouter than others. Femur II with a main spur (proximal) and an axillary process (distally), genu II and tibia II with a spur (Figure 3G). Other characteristics as in female.

**Deutonymph** (n=16) (Figures 4, 5)

*Dorsal idiosoma* (Figure 4A). Idiosoma weakly sclerotized, usually yellowish or tawny in color, length 569–628, width 404–436. Podonotal and opisthonotal shields distinct and without reticulation. Posterior margin of podonotal shield (length 339–363 and width 328–367) convex, fitted closely into concave anterior margin of opisthonotal shield (length 130–152 and width
<figure><img src="image_5.png" /><figcaption>**Figure 3** *Cornigamasus pseudocliferius* n. sp., male. A – Dorsum; B – Venter; C – Trochanter, femur and genu of palp; D – Chelicera; E – Gnathotectum; F – Subcapitulum; G – Femur, genu and tibia of leg II.</figcaption></figure>
<figure><img src="image_5.png" /><figcaption>**Figure 3** *Cornigamasus pseudocliferius* n. sp., male. A – Dorsum; B – Venter; C – Trochanter, femur and genu of palp; D – Chelicera; E – Gnathotectum; F – Subcapitulum; G – Femur, genu and tibia of leg II.</figcaption></figure>
<figure><img src="image_6.png" /><figcaption>**Figure 4** *Cornigamasus pseudocliferius* n. sp., deutonymph. A – Dorsum; B – Tritosternum; C – Venter; D – Trochanter, femur and genu of palp; E – Gnathotectum; F – Subcapitulum; G – Chelicera.</figcaption></figure>
<figure><img src="image_6.png" /><figcaption>**Figure 4** *Cornigamasus pseudocliferius* n. sp., deutonymph. A – Dorsum; B – Tritosternum; C – Venter; D – Trochanter, femur and genu of palp; E – Gnathotectum; F – Subcapitulum; G – Chelicera.</figcaption></figure>
<figure><img src="image_7.png" /><figcaption>**Figure 5** *Cornigamasus pseudocliberius* n. sp., deutonymph. A – Leg I; B – Leg II; C – Leg III; D – Leg IV.</figcaption></figure>
<figure><img src="image_7.png" /><figcaption>**Figure 5** *Cornigamasus pseudocliberius* n. sp., deutonymph. A – Leg I; B – Leg II; C – Leg III; D – Leg IV.</figcaption></figure>
256-286). Podonotal shield with 18 pairs of setae. Setae s2, s6, r2, r4, r6 off shield and equal in length (27-31). Opisthonotal shield bearing nine pairs of setae. Membranous cuticle of opisthosoma with nine pairs of setae. All dorsal setae smooth. Lengths of dorsal setae on the shields: j1 33-36, j2 25-27, j3 30-34, j4 30-33, j5 27-29, j6 27-29, z1 24-26, z2 25-27, z3 29-31, z4 30-33, z5 35-37, z6 25-27, s1 26-29, s3 26-29, s4 27-30, r3 33-35, r5 29-31, J1 24-26, J2 25-27, J3 24-26, J4 24-26, Z1 29-32, Z2 25-27; Z3 32-35, S1 26-28, S2 28-29.

*Ventral idiosoma.* Tritosternum (Figure 4B) with two pilose laciniae (114-128) and a smooth base (45-56), flanked by two pairs of presternal platelets close to each other, comprising a large irregular inner pair and a smaller crescent-shaped outer pair (Figure 4C). Sternal shield bearing four pairs of setae (*st1-st4*), of which setae *st1* longest, *st4* shortest. Opistogastric region with 15 pairs of setae and two pairs of sclerites, located between setae *st5*, *JV1* and *ZV1*. Metapodal shield located lateral setae *ZV1* and *ZV2*. Anal shield reticulated. *pa* (22-25) longer than *po* (16-18). All ventral setae smooth. Peritreme length 317-338. Lengths of setae: *st1* 31-34, *st2* 29-32, *st3* 29-33, *st4* 24-27, *st5* 20-24, *JV1* 28-30, *JV2* 31-33, *JV3* 30-33, *JV4* 37-38, *JV5* 36-39, *ZV1* 19-22, *ZV2* 30-32, *ZV3* 29-31, *ZV4* 27-29, *SV2* 20-24, *SV3* 28-30, *SV4* 32-34.

*Gnathosoma.* Palp length 182-205, other characters as in female; trochanter, femur and genu as in the Figure 4D. Gnathotectum similar to adults in shape, except that some denticles near medial prong smaller than in adults, without forked end (Figure 4E). Lengths of setae: *h1* 50-56, *h2* 28-32, *h3* 65-69, *pcx* 42-46 (Figure 4F). Fixed digit of chelicera with three teeth, movable digit with five teeth (Figure 4G).

*Legs* (Figure 5). Lengths of legs I-IV: 613–637, 467–495, 407–443, 578–624, respectively. Tarsus I with an ambulacrum. All leg setae simple and smooth. Other characteristics as in female.

**Other stages** — Unknown.

## Etymology

This species is named after its similarities to *C. ocliferius* Skorupski & Witaliński, 1997.

## Differential taxonomy

The newly described species is morphologically similar to adults of *C. ocliferius* in the setal locations, shape and number on the podonotal shield and the absence of ambulacrum on tarsus I (Skorupski & Witaliński 1997; Witaliński 2014; Negm 2016; Hruzova & Fend'a 2017). The male of *C. ocliferius* was reported as a holotype. *C. pseudocliferius n. sp.* male is distinguished from *C. ocliferius* by the shape of setae, of which *j4*, *JV3*, *ZV2*, *ZV3* and *SV1* are smooth rather than finely pilose; *C. pseudocliferius n. sp.* male is also distinguished from *C. ocliferius* by the armature of legs, of which the genu I and genu IV are smooth rather than bearing a spur; as well as by the number of spurs on leg II. In *C. pseudocliferius n. sp.*, the femur II bears calcar and axillary spur and genu II is equipped with a spur, whereas in *C. ocliferius* there is only a small conical spur on femur II and the spur on genu II is absent.

In the female, *C. pseudocliferius n. sp.* is distinguished from *C. ocliferius* by the form of the setae on the membranous cuticle of opisthosoma, of which eight pairs are thick and distally pilose rather than ten pairs; *C. psuedocliferius n. sp.* is also distinguished from *C. ocliferius* by the number of presternal platelets, it has two pairs rather than one pair; as well as by the arrangement of poroid *idZ3*, which is located anterolaterally to seta *Z3* rather than posterolaterally.

In the deutonymph, *C. pseudocliferius n. sp.* is distinguished from *C. ocliferius* by the dental number on the fixed digit of chelicera, which has three teeth rather than five teeth; *C. psuedocliferius n. sp.* is also distinguished from *C. ocliferius* by the number of setae on the membranous cuticle of opisthosoma, which bears nine pairs rather than twelve pairs.
256–286). Podonotal shield with 18 pairs of setae. Setae s2, s6, r2, r4, r6 off shield and equal in length (27–31). Opisthonotal shield bearing nine pairs of setae. Membranous cuticle of opisthosoma with nine pairs of setae. All dorsal setae smooth. Lengths of dorsal setae on the shields: j1 33–36, j2 25–27, j3 30–34, j4 30–33, j5 27–29, j6 27–29, z1 24–26, z2 25–27, z3 29–31, z4 30–33, z5 35–37, z6 25–27, s1 26–29, s3 26–29, s4 27–30, r3 33–35, r5 29–31, J1 24–26, J2 25–27, J3 24–26, J4 24–26, Z1 29–32, Z2 25–27; Z3 32–35, S1 26–28, S2 28–29.

*Ventral idiosoma.* Tritosternum (Figure 4B) with two pilose laciniae (114–128) and a smooth base (45–56), flanked by two pairs of presternal platelets close to each other, comprising a large irregular inner pair and a smaller crescent-shaped outer pair (Figure 4C). Sternal shield bearing four pairs of setae (*st1–st4*), of which setae *st1* longest, *st4* shortest. Opistogastric region with 15 pairs of setae and two pairs of sclerites, located between setae *st5*, *JV1* and *ZV1*. Metapodal shield located lateral setae *ZV1* and *ZV2*. Anal shield reticulated. *pa* (22–25) longer than *po* (16–18). All ventral setae smooth. Peritreme length 317–338. Lengths of setae: *st1* 31–34, *st2* 29–32, *st3* 29–33, *st4* 24–27, *st5* 20–24, *JV1* 28–30, *JV2* 31–33, *JV3* 30–33, *JV4* 37–38, *JV5* 36–39, *ZV1* 19–22, *ZV2* 30–32, *ZV3* 29–31, *ZV4* 27–29, *SV2* 20–24, *SV3* 28–30, *SV4* 32–34.

*Gnathosoma.* Palp length 182–205, other characters as in female; trochanter, femur and genu as in the Figure 4D. Gnathotectum similar to adults in shape, except that some denticles near medial prong smaller than in adults, without forked end (Figure 4E). Lengths of setae: *h1* 50–56, *h2* 28–32, *h3* 65–69, *pcx* 42–46 (Figure 4F). Fixed digit of chelicera with three teeth, movable digit with five teeth (Figure 4G).

*Legs* (Figure 5). Lengths of legs I–IV: 613–637, 467–495, 407–443, 578–624, respectively. Tarsus I with an ambulacrum. All leg setae simple and smooth. Other characteristics as in female.

**Other stages** — Unknown.

## Etymology

This species is named after its similarities to *C. ocliferius* Skorupski & Witaliński, 1997.

## Differential taxonomy

The newly described species is morphologically similar to adults of *C. ocliferius* in the setal locations, shape and number on the podonotal shield and the absence of ambulacrum on tarsus I (Skorupski & Witaliński 1997; Witaliński 2014; Negm 2016; Hruzova & Fend'a 2017). The male of *C. ocliferius* was reported as a holotype. *C. pseudocliferius n. sp.* male is distinguished from *C. ocliferius* by the shape of setae, of which *j4*, *JV3*, *ZV2*, *ZV3* and *SV1* are smooth rather than finely pilose; *C. pseudocliferius n. sp.* male is also distinguished from *C. ocliferius* by the armature of legs, of which the genu I and genu IV are smooth rather than bearing a spur; as well as by the number of spurs on leg II. In *C. pseudocliferius n. sp.*, the femur II bears calcar and axillary spur and genu II is equipped with a spur, whereas in *C. ocliferius* there is only a small conical spur on femur II and the spur on genu II is absent.

In the female, *C. pseudocliferius n. sp.* is distinguished from *C. ocliferius* by the form of the setae on the membranous cuticle of opisthosoma, of which eight pairs are thick and distally pilose rather than ten pairs; *C. pseudocliferius n. sp.* is also distinguished from *C. ocliferius* by the number of presternal platelets, it has two pairs rather than one pair; as well as by the arrangement of poroid *idZ3*, which is located anterolaterally to seta *Z3* rather than posterolaterally.

In the deutonymph, *C. pseudocliferius n. sp.* is distinguished from *C. ocliferius* by the dental number on the fixed digit of chelicera, which has three teeth rather than five teeth; *C. pseudocliferius n. sp.* is also distinguished from *C. ocliferius* by the number of setae on the membranous cuticle of opisthosoma, which bears nine pairs rather than twelve pairs.
# Key to species of the genus Cornigamasus known in China

## Females

1. Ambulacrum on tarsus I absent; opisthonotal shield with two pairs of distally pilose setae...
   C. pseudocliferius n. sp.
   — Ambulacrum on tarsus I present; opisthonotal shield with three or 12 pairs of distally pilose setae.
   2

2. Podonotal shield with four and opisthonotal shields with three pairs of distally pilose setae.
   — All dorsal setae distally pilose setae
   C. oulaensis

3. Endogynium with lateral lines forming a curtain-shaped decoration bilaterally and a conchoidal base.
   C. allotritosternus
   — Endogynium with a transversely oriented granular band at posterior margin with a forward-protruding tooth on one side
   C. lunaris

## Males

1. Ambulacrum on tarsus I absent; podonotal shield with five pairs of distally pilose setae...
   C. pseudocliferius n. sp.
   — Ambulacrum on tarsus I present; podonotal shield with four or 23 pairs of setae pilose distally.
   2

2. Podonotal and opisthonotal shield with four pairs of distally pilose setae
   — All dorsal setae distally pilose
   C. oulaensis

3. Tritosternum present; spurs on genu II and tibia II located close to a middle position.
   C. allotritosternus
   Tritosternum absent; spurs on genu II and tibia II located at the distal margin
   C. lunaris

## Deutonymphs

1. Opisthonotal shield with nine pairs of setae
   C. pseudocliferius n. sp.
   — Opisthonotal shield with 12 pairs of setae
   2

2. Some setae (j1, j4, r3, z5, Z3, J5, Z6) thick and distally pilose
   C. allotritosternus
   — All dorsal setae distally smooth and pointed
   3

3. Podonotum with 18 pairs of setae
   C. lunaris
   — Podonotum with 19 or 20 pairs of setae
   C. oulaensis

# Acknowledgement

We express our thanks to two reviewers for their insightful comments on the manuscript. We sincerely thank Dr. Bruce Halliday for the help to revision for English writing. This work was supported by the National Natural Science Foundation of China (No. 31872275 and 32160118), PhD Foundation of Anshun University (asxybsjj202211 and asxybsjj202212), Key Laboratory of Plants Protection Informatization for Featured and Efficient Agriculture in Central Guizhou Province (Qianjiaoji KY [2022] No. 052).
# Key to species of the genus Cornigamasus known in China

## Females

1. Ambulacrum on tarsus I absent; opisthonotal shield with two pairs of distally pilose setae...
   C. pseudocliferius n. sp.
   — Ambulacrum on tarsus I present; opisthonotal shield with three or 12 pairs of distally pilose setae...
   2

2. Podonotal shield with four and opisthonotal shields with three pairs of distally pilose setae.
   — All dorsal setae distally pilose setae...
   C. oulaensis

3. Endogynium with lateral lines forming a curtain-shaped decoration bilaterally and a conchoidal base...
   C. allotritosternus
   — Endogynium with a transversely oriented granular band at posterior margin with a forward-protruding tooth on one side...
   C. lunaris

## Males

1. Ambulacrum on tarsus I absent; podonotal shield with five pairs of distally pilose setae...
   C. pseudocliferius n. sp.
   — Ambulacrum on tarsus I present; podonotal shield with four or 23 pairs of setae pilose distally...
   2

2. Podonotal and opisthonotal shield with four pairs of distally pilose setae...
   — All dorsal setae distally pilose...
   C. oulaensis

3. Tritosternum present; spurs on genu II and tibia II located close to a middle position...
   C. allotritosternus
   Tritosternum absent; spurs on genu II and tibia II located at the distal margin...
   C. lunaris

## Deutonymphs

1. Opisthonotal shield with nine pairs of setae...
   C. pseudocliferius n. sp.
   — Opisthonotal shield with 12 pairs of setae...
   2

2. Some setae (j1, j4, r3, z5, Z3, J5, Z6) thick and distally pilose...
   C. allotritosternus
   — All dorsal setae distally smooth and pointed...
   3

3. Podonotum with 18 pairs of setae...
   C. lunaris
   — Podonotum with 19 or 20 pairs of setae...
   C. oulaensis

## Acknowledgement

We express our thanks to two reviewers for their insightful comments on the manuscript. We sincerely thank Dr. Bruce Halliday for the help to revision for English writing. This work was supported by the National Natural Science Foundation of China (No. 31872275 and 32160118), PhD Foundation of Anshun University (asxybsjj202211 and asxybsjj202212), Key Laboratory of Plants Protection Informatization for Featured and Efficient Agriculture in Central Guizhou Province (Qianjiaoji KY [2022] No. 052).
ORCID

Mao-Yuan Yao ID https://orcid.org/0000-0002-5475-046X

Jian-Xin Chen ID https://orcid.org/0000-0001-8787-6678

Tian-Ci Yi ID https://orcid.org/0000-0002-9953-3709

Dao-Chao Jin ID https://orcid.org/0000-0003-2727-5621

References

Athias-Henriot C. 1971. La divergence néotaxique des Gamasides (Arachnides). Bulletin Scientifique de Bourgogne, 28, 93-106.

Athias-Henriot C. 1975. Nouvelles notes sur les Amblyseiini II. Le relevé organotaxique de la face dorsaleadulte (Gamasides, Protoadenique, Phytoseiidae). Acarologia, 17, 20-29. https://doi.org/10.1080/00222936308651393

Berlese A. 1882. Acari, Myriopoda et Scorpiones hucusque in Italia reperta. Orde Mesostigmata (Gamasides). Typis Seminarii (Padua), 63, 1-143. https://doi.org/10.5962/bhl title.1589

Evans G.O. 1963a. Observation on the chaetotaxy of the legs in the free-living Gamasina (Acari: Mesostigmata). Bull. br. Mus. nat. Hist. Zool., 10, 275-303. https://doi.org/10.5962/bhl part.20528

Evans G.O. 1963b. Some observations on the chaetotaxy of the pedipalps in the Mesostigmata (Acari). J. Nat. Hist. 6(69): 513527. https://doi.org/10.1080/00222936308651393

Evans G.O., Till W.M. 1979. Mesostigmatic mites of Britain and Ireland (Chelicerata: Acari: Parasitiformes). An introduction to their external morphology and classification. Trans. Zool. Soc. London, 35, 139-270. https://doi.org/10.1111/j.1096-3642.1979.tb00059.x

Gu Y.M., Wang J.S., Yang X.Z., Li F.H. 1987. Mites of the subfamily Parasitidae in China with descriptions of three new species (Acarina: Parasitidae). Acta Zootaxonomica Sinica, 12(1), 40-48. (In Chinese)

Hrúzová K., Fendá P. 2017. First record of *Parasitus americanus* (Berlese, 1905) and *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 (Acari: Mesostigmata: Parasitidae) from Slovakia. Checklist, 13(4), 239-243. https://doi.org/10.15560/13.4.239

Hrúzová K., Fendá P. 2018. The family Parasitidae (Acari: Mesostigmata)-history, current problems and challenges. Acarologia, 58 (Suppl), 25-42. https://doi.org/10.24349/acarologia/20184280

Hyatt K.H. 1980. Mites of the subfamily Parasitinae (Mesostigmata: Parasitidae) in the British Isles. Bull. Br. mus. nat. hist., 38(5), 237-378. https://doi.org/10.5962/p.12620

Juvara-Balş I., Athias-Henriot C. 1972. Définition de *Phityogamasus* n. g. et redescription de son espèce type, *Parasitus primitivus* Oudemans (Gamasides, Parasitidae). Acarologia, 13, 446-459.

Juvara-Bals I. 2019. *Occigamasus*, a new genus of pergamasine mites, with description of two new species from the west coast of North America (Parasitiformes: Gamasina: Parasitidae). Acarologia, 59(4), 551-570. https://doi.org/10.24349/acarologia/20194354

Ma L.M. 1986. New species of subfamily Parasitinae from north Qing-Zang Plateau, China. I. Genera *Parasitus* and *Cornigamusus* (Acarina: Parasitidae). Acta Zootaxonomica Sinica, 11, 379-388.

Ma, L.M. 2005. Replacement name for *Cornigamusus lunaroides* Ma, 1986 and studies of the genus *Poecilochirus* in northern China (Acari: Gamasina: Parasitidae). Acta Arachnologica Sinica, 14(2), 79-82

Ma L.M. and Bai X.L. 2017. Redescription of *Cornigamusus lunaris* (Berlese, 1882) (Acari: Mesostigmata: Parasitidae). Acta Arachnologica Sinica, 26(2), 91-93.

Makarova O.L. 2019. North Pacific versus North Atlantic: a case with species of the amphiboreal littoral mite genus *Thalassogamasus* gen. nov. (Parasitifomes, Mesostigmata, Parasitidae). Zootaxa, 4647(1), 457-485. https://doi.org/10.11646/zootaxa.4647.1.29

Negm, M.W. 2016. Predatory mites of the family Parasitidae Oudemans (Acari: Mesostigmata) from Egypt: redescriptions, new record and a key to species. African Entomology, 24(2), 460-475. https://doi.org/10.4001/003.024.0460

Oudemans A.C. 1901. Notes on Acari. Ser. 3. Tijdschr. nederl. dierk. Vereen., Leyden, 7, 50-88.

Skorupski M., Witaliński W. 1997. *Cornigamusus ocliferius* sp. n., a new gamasid mite from Poland (Acari: Parasitidae). Genus, 8, 145-152.

Witaliński W. 2014. Description of the female of *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 with a key to *Cornigamusus* species (Parasitiformes: Mesostigmata: Gamasida: Parasitidae). Genus, 25, 341-350.

Witaliński W., Skorupski M., Juvara-Bals I. 2005. Deutonymph of *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 (Acari: Gamasida: Parasitidae). Genus, 16(1), 145-153.

Yao M.Y., Yi T.C., Jin D.C., Guo J.J. 2020a. A new species of *Psilogamasus* Athias-Henriot, 1969 from China and redefinition of the genus (Parasitiformes: Parasitidae). Acarologia, 60(4), 1-11. https://doi.org/10.24349/acarologia/20204404

Yao M.Y., Yi T.C., Guo J.J., Jin D.C. 2020b. Description of *Cornigamusus allotritosternus* sp. nov. (Mesostigmata: Parasitidae) from China, with an emphasis on the ontogenetic development of setae. Zootaxa, 4821(3), 462-486. https://doi.org/10.11646/zootaxa.4821.3.3
ORCID

Mao-Yuan Yao ID https://orcid.org/0000-0002-5475-046X

Jian-Xin Chen ID https://orcid.org/0000-0001-8787-6678

Tian-Ci Yi ID https://orcid.org/0000-0002-9953-3709

Dao-Chao Jin ID https://orcid.org/0000-0003-2727-5621

References

Athias-Henriot C. 1971. La divergence néotaxique des Gamasides (Arachnides). Bulletin Scientifique de Bourgogne, 28, 93-106.

Athias-Henriot C. 1975. Nouvelles notes sur les Amblyseiini II. Le relevé organotaxique de la face dorsaleadulte (Gamasides, Protoadenique, Phytoseiidae). Acarologia, 17, 20-29. https://doi.org/10.1080/00222936308651393

Berlese A. 1882. Acari, Myriopoda et Scorpiones hucusque in Italia reperta. Orde Mesostigmata (Gamasides). Typis Seminarii (Padua), 63, 1-143. https://doi.org/10.5962/bhl title.1589

Evans G.O. 1963a. Observation on the chaetotaxy of the legs in the free-living Gamasina (Acari: Mesostigmata). Bull. br. Mus. nat. Hist. Zool., 10, 275-303. https://doi.org/10.5962/bhl part.20528

Evans G.O. 1963b. Some observations on the chaetotaxy of the pedipalps in the Mesostigmata (Acari). J. Nat. Hist. 6(69): 513527. https://doi.org/10.1080/00222936308651393

Evans G.O., Till W.M. 1979. Mesostigmatic mites of Britain and Ireland (Chelicerata: Acari: Parasitiformes). An introduction to their external morphology and classification. Trans. Zool. Soc. London, 35, 139-270. https://doi.org/10.1111/j.1096-3642.1979.tb00059.x

Gu Y.M., Wang J.S., Yang X.Z., Li F.H. 1987. Mites of the subfamily Parasitidae in China with descriptions of three new species (Acarina: Parasitidae). Acta Zootaxonomica Sinica, 12(1), 40-48. (In Chinese)

Hrúzová K., Fendá P. 2017. First record of *Parasitus americanus* (Berlese, 1905) and *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 (Acari: Mesostigmata: Parasitidae) from Slovakia. Checklist, 13(4), 239-243. https://doi.org/10.15560/13.4.239

Hrúzová K., Fendá P. 2018. The family Parasitidae (Acari: Mesostigmata)-history, current problems and challenges. Acarologia, 58 (Suppl), 25-42. https://doi.org/10.24349/acarologia/20184280

Hyatt K.H. 1980. Mites of the subfamily Parasitinae (Mesostigmata: Parasitidae) in the British Isles. Bull. Br. mus. nat. hist., 38(5), 237-378. https://doi.org/10.5962/p.12620

Juvara-Balş I., Athias-Henriot C. 1972. Définition de *Phityogamasus* n. g. et redescription de son espèce type, *Parasitus primitivus* Oudemans (Gamasides, Parasitidae). Acarologia, 13, 446-459.

Juvara-Bals I. 2019. *Occigamasus*, a new genus of pergamasine mites, with description of two new species from the west coast of North America (Parasitiformes: Gamasina: Parasitidae). Acarologia, 59(4), 551-570. https://doi.org/10.24349/acarologia/20194354

Ma L.M. 1986. New species of subfamily Parasitinae from north Qing-Zang Plateau, China. I. Genera *Parasitus* and *Cornigamusus* (Acarina: Parasitidae). Acta Zootaxonomica Sinica, 11, 379-388.

Ma, L.M. 2005. Replacement name for *Cornigamusus lunaroides* Ma, 1986 and studies of the genus *Poecilochirus* in northern China (Acari: Gamasina: Parasitidae). Acta Arachnologica Sinica, 14(2), 79-82

Ma L.M. and Bai X.L. 2017. Redescription of *Cornigamusus lunaris* (Berlese, 1882) (Acari: Mesostigmata: Parasitidae). Acta Arachnologica Sinica, 26(2), 91-93.

Makarova O.L. 2019. North Pacific versus North Atlantic: a case with species of the amphiboreal littoral mite genus *Thalassogamasus* gen. nov. (Parasitifomes, Mesostigmata, Parasitidae). Zootaxa, 4647(1), 457-485. https://doi.org/10.11646/zootaxa.4647.1.29

Negm, M.W. 2016. Predatory mites of the family Parasitidae Oudemans (Acari: Mesostigmata) from Egypt: redescriptions, new record and a key to species. African Entomology, 24(2), 460-475. https://doi.org/10.4001/003.024.0460

Oudemans A.C. 1901. Notes on Acari. Ser. 3. Tijdschr. nederl. dierk. Vereen., Leyden, 7, 50-88.

Skorupski M., Witaliński W. 1997. *Cornigamusus ocliferius* sp. n., a new gamasid mite from Poland (Acari: Parasitidae). Genus, 8, 145-152.

Witaliński W. 2014. Description of the female of *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 with a key to *Cornigamusus* species (Parasitiformes: Mesostigmata: Gamasida: Parasitidae). Genus, 25, 341-350.

Witaliński W., Skorupski M., Juvara-Bals I. 2005. Deutonymph of *Cornigamusus ocliferius* Skorupski & Witaliński, 1997 (Acari: Gamasida: Parasitidae). Genus, 16(1), 145-153.

Yao M.Y., Yi T.C., Jin D.C., Guo J.J. 2020a. A new species of *Psilogamasus* AthiasHenriot, 1969 from China and redefinition of the genus (Parasitiformes: Parasitidae). Acarologia, 60(4), 1-11. https://doi.org/10.24349/acarologia/20204404

Yao M.Y., Yi T.C., Guo J.J., Jin D.C. 2020b. Description of *Cornigamusus allotritosternus* sp. nov. (Mesostigmata: Parasitidae) from China, with an emphasis on the ontogenetic development of setae. Zootaxa, 4821(3), 462-486. https://doi.org/10.11646/zootaxa.4821.3.3