Eharius chergui
Creators: name: Ma, Min
name: Fan, Qing-Hai
name: Zhang, Zhi-Qiang
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Phytoseiidae
Eharius
Eharius chergui

description: Eharius chergui (Athias-Henriot, 1960)
Amblyseius chergui Athias-Henriot, 1960: 289.
Amblyseius (Kampimodromus) chergui: Wainstein, 1962: 14.
Typhlodromus chergui: Hirschmann, 1962.
Eharius (Eharius) chergui: Kolodochka, 1995: 96.
LARVA (n=5, Figs 1–2, 10A, 11A, Table 2)
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Idiosoma (Figs 1A & B, Table 2) 174 (163–182) long along its midline, 86 (85–87) wide at level of s4. DORSUM (Fig. 1A): podonotal shield smooth, weakly sclerotized, bearing nine pairs of smooth setae (j1, j3, j4, j5, j6, z2, z4, z5 and s4) and one pair of big lyrifissures (idla), s4 longest and blunt tipped, j1 longer than z4; other setae minute. Opisthonotal region weakly sclerotized with a few striations, bearing two pair of setae (J5 and Z4), three pairs of lyrifissures (idm4, idx and idl2), Z4 smooth and knobbed apically. One pair of setal nubs (Z1) and two pairs of lyrifissures (idm2 and is1) on integument between podonotal and opisthonotal shields. Stigmata and peritremes absent. VENTER (Fig. 1B): without discernible shields. Coxisternal area bearing three pairs of setae (st1, st2 and st3), without discernible lyrifissures. Four pairs of ventrocentral setae (JV1, JV2, ZV2 and JV5) on membranous cuticle around anal valve, JV2 longer than ZV2, other setae minute; a pair of paranal setae (pa) and a postanal seta (po) present around anal valve, pa as long as po, longer than JV2. JV2, pa, and po on small anal shield.
Gnathosoma. CHELICERAE (Fig. 1C) with movable digit 13 long, without tooth; fixed digit 14 (14–15) long, with a small subapical tooth and two vague medial teeth, pilus dentilis 3 (2–4). PALP (Fig. 10A) with trochanter devoid of seta; femur with three simple setae; genu bearing five simple setae; tarsal apotele two-pronged. HYPOSTOME (Fig. 11A) with only two pairs of hypostomal setae (h1 and h2); deutosternal groove present but weakly developed, without rows of denticles; corniculi horn-like.
Legs (Fig. 2). Leg I 175 (170–179) long, setal formula (coxa to basitarsus): 2, 4, 10, 8, 8, 0. Leg II 155 (152– 156) long, setal formula: 2, 4, 7, 6, 7, 4. Leg III 144 (138–148) long, setal formula: 1, 4, 5, 6, 7, 4.
PROTONYMPH (n=5; Figs 3–4, 10B, 11B, Table 2)
Idiosoma (Figs 3A & 3B, Table 2) 227 (211–234) long along midline, 99 (98–99) wide at level of s4, DORSUM: podonotal and opisthonotal shields discernible. Podonotal shield with nine pairs of attenuate setae and three pairs of lyrifissures (id2, id4 and idla) and a pair of big solenostomes (gd2), j3, z2 and z4 longer than those in larval stage; lateral setae longer than medial setae, s4 longest. Muscle marks present between j3 and j4, j5 and j6. Opisthonotal shield with four pairs of setae (J5, S5, Z4 and Z5), six pairs of lyrifissures (idm4, idm5, idm6, idl3, idl4 and idx) and a pair of solenostomes (gd9), J5, S5 and Z4 smooth and short, Z5 long, serrated and knobbed apically. Three pairs of setae (J2, S2, Z1) and four pairs of lyrifissures (idm2, idm3, idl2 and is1) present on integument between podonotal and opisthonotal shields; S2 long and apically blunt. Lateral cuticle with setae r3 and R1 present. Stigmata located ventrolateral to coxae III and IV. Peritremes extending beyond level of j6. VENTER (Fig. 3B): sternal area without discernible shield, with three pairs of setae (st1, st2 and st3) and two pairs of lyrifissures (iv1 and iv2). Four pairs of opisthogastric setae (JV1, JV2, JV5 and ZV2) present on cuticle around anal valve, a pair of paranal setae (pa) and a postanal seta (po) of subequal length present around anal valve.
Gnathosoma. CHELICERAE (Fig. 3C) with movable digit 16 (15–17) long, without tooth, fixed digit 19 (18– 22) long, bearing a small subapical tooth and two small medial teeth, pilus dentilis 5 long, close to second tooth. PALP (Fig. 10B) with a seta on trochanter; femur with no setae added; genu chaetotaxy identical to that in larva. Tarsal apotele two-pronged. HYPOSTOME (Fig. 11B) with three pairs of hypostomal setae (h1, h2 and h3) and a pair of palpcoxal setae (pc). deutosternal groove weak, bearing seven rows of denticles; corniculi horn-like.
Legs (Fig. 4). Leg I 189 (183–201) long, chaetotaxy same as in larva. Leg II 165 (162–169) long, chaetotaxy same as in larva. Leg III 155 (152–158) long, coxa with one seta added. Leg IV 179 (164–192) long, setal formula: 1, 4, 4, 5, 6, 4.
DEUTONYMPH (n= 5♀, 2♂, Figs 5–6, 10C, 11C, Table 2)
Idiosoma (Figs 5 A–D, Table 2) 268 (248–269) long along its midline, 117 (115–118) wide at level of setae s4; podonotal and opisthonotal shields fused, DORSUM with a few striae, bearing 16 pairs of setae, all smooth except Z5 barbed and apically blunt; with two pair of solenostomes (gd2 and gd9) and 13 pairs of lyrifissures (id1, id2, id4, idla, idl2, idl3, idl4, idm3, idm4, idm5, idm6, idx and is1); muscle marks discernible, between j3 and J2; interscutal cuticle with setae r3 and R1. Peritremes short, reaching to r3 level. VENTER (Fig. 5B): smooth, without discernible shields. Coxisternal area bearing five pairs of setae, st4 and st5 added, with three pairs of lyrifissures (iv1, iv2 and iv3). Sex distinguishable, female deutonymph with five pairs of opisthogastric setae (JV1, JV2, JV5, ZV1 and ZV2) and five or seven pairs of lyrifissures on membranous cuticles around anal valve; male deutonymph with four pairs of opisthogastric setae and five pairs of lyrifissures on membranous cuticles around anal valve. A pair of paranal setae (pa) and a postanal seta (po) of subequal length present around anal valve on anal shield, a pair of marginal muscle marks situated at level of anus; a pair of solenostomes (gv3) posterior to JV2, distance gv3-gv3 29 (27–30). A pair of marginal muscle marks situated at anal valve level. Primary plate and secondary plate absent.
Gnathosoma. CHELICERAE (Figs 5E & F) with movable digit 18 (17–19) long, without teeth; fixed digit 21 (19–22) long, bearing subapical tooth and one or two medial teeth, pilus dentilis 6 (5–7) long, close to second tooth. PALP (Fig. 10C). Trochanter with two setae; femur with five simple setae; genu with six simple setae. Tarsal apotele two-pronged. HYPOSTOME (Fig. 11C) with three pairs of hypostomal setae (h1, h2 and h3) and one pair of palpcoxal setae (pc). Deutosternal groove bearing seven rows of denticles; corniculi horn-like.
Legs (Fig. 6). Leg I 208 (200–219) long, setal formula (coxa to basitarsus): 2, 5, 12, 10, 10, 0. Trochanter with one seta added, femur, genu and tibia each with two setae added. Leg II 187 (183–192) long, setal formula: 2, 5, 10, 7, 7, 4. Trochanter and genu each with one seta added, femur with three setae added. Leg III 178 (175–183) long, setal formula: 2, 5, 6, 7, 7, 4. Trochanter, femur and genu each with one seta added. Leg IV 226 (217–236) long, setal formula: 1, 5, 6, 7, 6, 4. Trochanter added one seta, Femur and genu with two setae added, respectively. Leg IV without macroseta.
FEMALE (n=5, Figs 7–8, 10D, 11D, Table 2)
Idiosoma (Fig. 7A & B, Table 2) 347 (337–353) long along its midline, 189 (170–208) wide. DORSUM ovoid, reticulated, with strong striae, muscle marks present between z5 and J5, with waist at R1 level, bearing 16 pairs of setae, slender, smooth except Z5 barbed and lightly blunt, two pairs of solenostomes (gd2 and gd9) and 17 pairs of lyrifissures (id1, id2, id3, id4, id6, idla, idl2, idl3, idl4, idm1, idm2, idm3, idm4, idm5, idm6, idx and is1), a duplex idx may present on one side; r3 and R1 smooth on interscutal cuticle. VENTER (Fig. 7B). Sternal shield 45 (37–54) long, 59 (57–63) wide at level of ZV2, smooth, with few striae, middle of anterior margin convex, posterior margin concave and wavy, bearing two pairs of setae (st1 and st2) and two pairs of pores (iv1 and iv2); st3 on a pair of small platelets, st4 and iv3 present on a pair of small platelets. Peritremes extending forward to z5 level. Genital shield smooth, 133 (126–137) long, 56 (55–60) wide. Paragenital lyrifissures located on soft cuticle close to st5. A series of horizontal sclerites present between genital and ventrianal shield; a pair of small platelets between ZV1 and ZV2. Ventrianal shield vase-shaped, 86 (85–87) long, 48 (45–52) wide, with few striae, waist presents at level of JV2; most specimens with three pairs of preanal setae (JV1, JV2 and ZV2), JV1 located on anterior margin and JV2 and ZV 2 in two transverse rows; in some specimens, one of ZV2 maybe off shield. A pair of solenostomes gv3 right posterior or slightly posteromedial to JV2, distance gv3-gv3 30 (28–32). A pair of marginal muscle marks situated at anal valve level. ZV1, JV5 and six pairs of lyrifissures present on membranous cuticle around ventrianal shield; JV5 smooth; a pair of paranal setae (pa) and a postanal seta (po) of subequal length around anal valve. Two pairs of metapodal platelets; primary metapodal platelets 11 (10–13) long, 2 wide; secondary metapodal platelets 32 (30–35) long, 4 (3–4) wide.
Spermathecal apparatus (Fig. 7D). Cervix cup-shaped, atrium oval and connected with cervix, with slender minor duct; major duct long and narrow.
Gnathosoma. CHELICEARAE (Fig. 7C) with movable digit 20 (19–20) long, toothless; fixed digit 25 long, bearing a subapical tooth and two medial visible teeth; pilus dentilis 6 (5–8) long, close to second teeth. PALP. (Fig. 10D) Two setae present on trochanter; femur with five simple setae; genu with six simple setae; tarsal apotele two-pronged as in deutonymph. HYPOSTOME (Fig. 11D) with three pairs of hypostomal setae (h1, h2 and h3) and one pair of palpcoxal setae (pc). Deutosternal groove with seven rows of denticles; corniculi horn-like.
Legs (Fig. 6). Leg I 225 (212–244), chaetotaxy of legs I same as in deutonymph. Leg II 195 (184–214) long; setal formula: 2, 5, 10, 8, 7, 4 (genu with one seta added). Leg III 193 (184–207) long; setal formula: 3, 5, 6, 7, 7, 4 (coxa with one seta added). Leg IV 254 (237–272) long; setal formula same as in deutonymph; without macroseta. ADULT MALE (n=4, Fig. 9, Table 2)
Idiosoma (Figs 9A & B, Table 2). 277 (269–284) long along its midline, 169 (155–178) wide. DORSUM ovoid, elongate, reticulated, strong striae, muscle marks present between j4 and J2, bearing 18 pairs of setae, all smooth except Z5 barbed; sixteen pairs of visible lyrifissures (id1, id2, id4, id6, idla, idl2, idl3, idl4, idm1, idm2, idm3, idm4, idm5, idm6, idx and is1) and two pairs of solenostomes (gd2 and gd9) and a pair of big hypertrophied gland; lateral setae r3 and R1 on dorsal shield, r3 longer than R1; muscle marks present between j4 and J2. VENTER (Fig. 9B). Sternogenital shield smooth, with a few striae on posterior margin, 139 (133–143) long along its midline, 52 (51–53) wide at level of st2, middle of anterior margin concave, posterior margin of shield slightly wavy, with five pairs of smooth setae (st1, st2, st3, st4 and st5) and three pairs of lyrifissures iv1, iv2 and iv3. Peritremes extending forward to z5 level. Ventrianal shield with transverse or oblique striae throughout, approximately triangle, middle of anterior margin with rounded median lobe, 97 (96–98) long, 132 (130–136) wide (at corners of anterior margin), with three pairs of preanal setae (JV1, JV2 and ZV2) and four pairs of lyrifissures and one pair of solenostomes (gv3) that posteromedial to JV2, distance gv3-gv3 25 (23–26); a pair of paranal setae (pa) and a postanal seta (po) subequal in length; Setae JV5 smooth and two pairs of lyrifissures on cuticle surrounding ventrianal shield.
Gnathosoma. CHELICERA (Fig. 9C) with movable digit 18 (17–18) long, bearing one subapical tooth and two medial teeth and one pilus dentilis, 5 (5–6) long; fixed digit 21 (19–22) long, without teeth; Spermatodactyl Lshaped, heel reduced. PALP. Chaetotaxy same as that of female. HYPOSTOME. Chaetotaxy same as female.
Legs. Chaetotaxy same as that of female.
description: Published as part of Ma, Min, Fan, Qing-Hai & Zhang, Zhi-Qiang, 2018, Ontogenetic changes in the morphology of Eharius chergui (Acari: Phytoseiidae), pp. 23-39 in Zootaxa 4540 (1) on pages 25-34, DOI: 10.11646/zootaxa.4540.1.5, http://zenodo.org/record/2616198