Neoribates (Neoribates) subiasi Yu, Pan & Liu, 2024, sp. nov.
Creators: name: Yu, Bixiao
name: Pan, Xue
name: Liu, Dong
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Parakalummidae
Neoribates
Neoribates subiasi

description: Neoribates (Neoribates) subiasi sp. nov.
(Figures 1–5)
Diagnosis: Body size: 500–525 × 300–310. Rostrum narrowly rounded. Lamella with end slightly curving anteromedially. Translamella represented by two short lines near lamellae. Sublamella diagonal to lamella. Rostral, lamellar and interlamellar setae long, setiform and barbed. Bothridial seta short, with oval-shaped head. Notogaster with 11 pairs of short and thin setae, one pair of dp present. Anogenital setae short, setiform, thin, smooth. Five pairs of genital setae. Seta ad 3 inserted laterally and distanced from anal aperture. Leg pretarsus with three claws. Tarsus I with 20 setae.
Description. Measurements. Body length: 500 (holotype, female), 510–525 (two paratypes, females); body width: 300 (holotype), 306–310 (two paratypes).
Integument (Figs 1; 2A–B; 4–5). Body color yellowish-brown. Body surface smooth.
Prodorsum (Figs 1A; 2A; 4A–B; 5A–C). Prodorsum triangularly oval, rostral part narrowly rounded in dorsal view. Lamella about half of prodorsum length, located dorsolaterally, its end slightly curving anteromedially. Translamella represented by two short lines near lamellae. Sublamella about two thirds of the lamella (measured in lateral view), diagonal to lamella. Sublamellar porose area rounded (12–14), partially covered by sublamella. Rostral (75–78), lamellar (100–104) and interlamellar (110–112) setae setiform and sparsely barbed; ro inserted on lateral side of rostrum, le inserted on end of lamella. Bothridial seta (40–42) with short stalk (13–14) and longer (27–28) oval, roughened head. Exobothridial seta not detectable. Dorsosejugal porose area diffuse, located posterolateral to interlamellar seta.
Notogaster (Figs 1A; 2A–B; 4A, C; 5A–E). Oval-shaped, distinctly longer than wide. Dorsosejugal suture convex medially. Dorsophragma oval in medium size. Eleven pairs of short (12–16), setiform, thin, smooth notogastral setae (c, la, lm, lp, dp, h 1 – h 3, p 1 – p 3). Four pairs of saccules with small opening and drop-like channel. Seta la inserted posterolaterally and close to Sa, lp inserted medial and close to S1, dp situated anteromedial to h 3, h 3 located anterolaterally of S2, S3 located posteriorly between h 1 and h 2. All lyrifissures distinct, im located posterior to lm, ip posterolateral to S3, ih anteromedial to p 3 and distanced from them, ips posterolateral to p 3 and distanced from them. Opisthonotal gland opening located anterolateral to S1. Circumgastric scissure distinct. Circumgastric sigillar band poorly visible.
Gnathosoma (Figs 1B; 2C–D; 4B; 5F). Subcapitulum size: 115–118 × 81–85. Three pairs of subcapitular setae similar in length (13–16), setiform, barbed, a slightly thicker than m and h. Two pairs of adoral setae (15–17) setiform, slightly barbed. Length of palp: 85–87. Palpal setal formula: 0-2-1-3-9(+ω), Solenidion little shorter than half length of palptarsus, straight, thickened, blunt-ended, attached to eupathidium (acm). Postpalpal seta (5) spiniform, smooth. Length of chelicera: 125–130. Two cheliceral setae setiform, barbed, cha (30–35) longer than chb (23–27).
Epimeral and lateral podosomal regions (Figs 1B; 2A; 4B–C; 5C, F). Epimeral setal formula: 3-1-3-3. All setae setiform, thin, 1c (17–19), 3c (22–25) and 4c (24–27) longer and heavily barbed, other setae (13–15) slightly barbed, seta 4b well developed. Pedotectum II nearly quadringular in ventral view. Discidium triangular. Circumpedal carina long, reaching anterior margin of ventral plate.
Anogenital region (Figs 1B; 2A–B; 4B–C; 5C, F). Five pairs of genital (11–14), one pair of aggenital (9–10), two pairs of anal (20–24), and three pairs of adanal (ad 1, ad 2 25–26; ad 3 19–20) setae setiform, thin, smooth. Distance between g 3 and g 4 largest; aggenital setae located between genital and anal apertures, and much close to genital aperture; seta ad 3 inserted laterally and distanced from anal aperture, between insertions level of setae an 1 and an 2. Adanal lyrifissure located close and parallel (sometimes slightly diagonal) to anal plate, at level of setae an 2. Marginal porose area observable, band-like.
Legs (Figs 3; 4; 5A). Leg pretarsus with three claws, median claw distinctly thicker than laterals, all slightly barbed on dorsal side. Dorsoparaxial porose area on all femora and on trochanters III, IV and posteroventral porose area on all tarsi well-developed. Anteroventral porose area on all tibiae present, but poorly visible. Formulas of leg setation and solenidia: I (1-5-3-4-20) [1-2-2], II (1-5-3-4-15) [1-1-2], III (2-3-1-3-15) [1-1-0], IV (1-2-2-4-12) [0-0- 0]; homology of setae and solenidia indicated in Table 1. Tarsus I with 20 setae. Seta s on tarsus I eupathidial-like, located between paired setae u and a. Famulus of tarsus I short, erect, slightly dilated distally, inserted between solenidion ω 2 and seta ft ”. Solenidion φ 1 on tibia I and σ on genu I of long size; solenidion φ on tibia II and III, σ on genu II and III, ω 1 on tarsus I, and ω 1 and ω 2 on tarsus II of medium size; other solenidia relatively shorter.
Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime (") setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae.
Material examined. Holotype: adult (NIGA, P7GF06 -M, female, in alcohol), CHINA, Jilin Province, Yanbian, Antu County, Erdaobaihe Town, north slope of Changbai Mountain (42.235206°N, 128.155682°E), 1046 m a.s.l., from litter under shrub, 15 Jul. 2021, leg. Dong Liu and Dandan Liu. Paratypes: two adults (NIGA, P7GF06 -M, female, in alcohol), same data as holotype.
Etymology. The new species is named in memory of Prof. Luis S. Subías (Departamento de Zoología, Facultad de Biología, Universidad Complutense, Madrid, Spain), a famous and outstanding acarologist, who has contributed significantly to the study of oribatid mites throughout the world.
Remarks. This new species is morphologically most similar to Neoribates (Neoribates) cupulatus Liang, Yang & Tang, 2014 from southwestern China (Oriental region) in having smooth body surface, similar body size, similar length and shape of the prodorsal setae, translamella interrupted medially, rostrum rounded in dorsal view, five pairs of genital setae, and seta ad 3 inserted laterally and distanced from anal aperture, but can be distinguished by following characters: (1) head of bothridial seta oval-shaped (versus cup-shaped in N. (N.) cupulatus); (2) notogaster with 11 pairs of setae, setae dp present (versus ten pairs, setae dp absent); (3) seta lp inserted medial to S1 (versus posterolateral to S1); (4) distance between setae ag longer than that between epimeral setae 4b (versus nearly equal); (5) anal and adanal setae longer, eg. anal setae 20–24, ad 1, ad 2 25–26, ad 3 19–20 (versus shorter, anal setae 6–8, adanal setae 8–10). Through communication with Dr. Liang W.Q. and Pro. Yang M.F, we have confirmed that the bothridial seta shape of N. (N.) cupulatus is similar to an inverted cone (cupped) which is distinctly different from the new species.
Compared with Neoribates (Neoribates) parvisetigerum (Aoki, 1965) and Neoribates (Neoribates) pallidus Aoki, 1988 (= Neoribates alius Fujikawa, 2007) (see also Choi & Namkoong 2002; Ermilov et al. 2014), they have similar shape of bothridial seta, but can be easily differed by (1) rostrum narrowly rounded in dorsal view (versus rostrum projects forward forming a rounded hump in N. (N.) parvisetigerum; broadly rounded in N. (N.) pallidus); (2) translamella represented by two short lines near lamellae (versus complete in N. (N.) parvisetigerum, absent in N. (N.) pallidus); (3) interlamellar seta more than two times longer than distance between them (versus equal or a little longer); (4) sublamella diagonal to lamella (versus parallel with lamella in N. (N.) pallidus); (5) 11 pairs of notogastral setae present (versus 10 pairs); (6) notogastral setae short (versus represented only by alveoli in N. (N.) pallidus); (7) seta lp inserted medial to S1 (versus posterolateral to S 1 in N. (N.) pallidus); (8) dorsosejugal suture convex ovally (versus convex trapezoidally in N. (N.) parvisetigerum); (9) pedotectum II broad, quadringular in shape (versus narrow, fin-like in N. (N.) parvisetigerum); (10) five genital setae present (versus four pairs in N. (N.) parvisetigerum )).
It also differs from Neoribates (Neoribates) fusiformis Zheng & Chen, 2024 from central China by the following characters: (1) sublamella long, diagonal to lamella (versus short and vaulted, not diagonal to lamella in N. (N.) fusiformis); (2) head of bothridial seta broader, rounded distally (versus narrower, with pointed tip); (3) 11 pairs of short notogastral setae (versus 10 pairs represented by alveoli); (4) distance between setae ag longer than that between epimeral setae 4b (versus nearly equal); (5) anal and adanal setae similar in length and shape (versus anal setae longer and thicker than adanal setae); (6) mutual distance ad 1 – ad 2 <ad 2 – ad 3 (versus ad 1 – ad 2 ≈ ad 2 – ad 3); (8) Setae l'' present on tarsus I (versus absent).
description: Published as part of Yu, Bixiao, Pan, Xue & Liu, Dong, 2024, Neoribates (Neoribates) subiasi sp. nov. (Acari, Oribatida, Parakalummidae) from Changbai Mountain, China, pp. 122-131 in Zootaxa 5556 (1) on pages 123-129, DOI: 10.11646/zootaxa.5556.1.11, http://zenodo.org/record/14595036