Hemigalichus chrotogale, Bochkov & Oconnor, 2005

Bochkov, Andre V. & Oconnor, Barry M., 2005, The life-cycle of Hemigalichus chrotogale sp. nov. (Acari: Listrophoridae), with comparative observations on listrophorid morphology, Journal of Natural History 39 (44), pp. 3811-3832 : 3818-3824

Hemigalichus chrotogale sp. nov.

( Figures 1–8 )

Type material

Homeomorphic male holotype (BMOC 99-0510-001 # 1), 12 homeomorphic male, 19 heteromorphic male, 30 female, 10 larva, 20 protonymph, and 43 teleonymph paratypes (BMOC 99-0510-001 # 2–135) ex Chrotogale owstoni Thomas, 1912 ( Carnivora : Viverridae ) (MVZ 186572), Vietnam: Vin Phuc Prov., Vinh Yen Dist., Tam Dao, 700– 1000 m, 21 ° 279140N, 105 ° 389310E, 12 June 1997, coll. J. L. Patton (JLP 16897).

Holotype and half of paratypes are deposited in ESEM, other paratypes in UMMZ, except for one male and one female paratype in FMNH, IRSNB, OSAL, USNM, and ZISP.

Homeomorphic male ( Figures 4 , 5 ). Body including gnathosoma 350–380 long (n 510) (350 in holotype), 140–150 wide (145). Gnathosoma 40 long, 35 wide in basal part. Ventrolateral projections of infracapitulum 30 long. Subcapitular setae (subc) 15 long. Supracoxal setae (elc.p.) 10 long. Prescapular shield 128–135 long (130). Postscapular shield 55–60 long (55), completely covered by 12–14 transverse lines. Hysteronotal shield entire, 130– 135 long in midline (130), completely striated, except for small space behind level of setae e1. Anterior margin of hysteronotal shield with deep concavity reaching level of setae d1. Cuticle between coxal fields II not striated. Progenital sclerite fused in anterior part with coxal apodemes IV by means of narrow curved projections bearing setae 4b. Aedeagus strongly reduced. Genital setae (g) apparently absent. Diameter of para-anal suckers 12. Legs III 95–100 long (100). Legs IV 110–120 long (120). Lengths of idiosomal setae: vi 4–6 (4), si 6–9 (6), se, c1, c2, d2, and h1 —all 20–25, cp 38–43 (40), c3, d1, h3, 1a–4a, and ps3 —all 10–11, e1 13–16, e2 24–30 (25), f2 4–6 (4), h2 120–130 (120), ps1–2 17–20 (18), thickened; lengths of some leg solenidia: v 1 I 15–17, v 3 I 40–45, v 1 II 22–24, and w I, II 70–77.

Heteromorphic male ( Figure 6 ) (10 paratypes). Distinguished from homeomorphic male only by larger body size, weaker ornamentation of hysteronotal shield, and greater development of ventral concavities on femora and genua III. Body, including gnathosoma, 468–497 long, 187–205 wide. Prescapular shield 140–150 long. Postscapular shield 70–75 long, covered by 10–15 transverse lines. Hysteronotal shield 180–190 long in median line, with few short lines in lateral parts and two to three transverse lines at level of trochanters IV. Diameter of anal suckers about 17. Legs III 170–175 long, legs IV 210–220 long. Femora and genua legs III and IV with ventral concavities and armed by heavy sclerotized crests. Lengths of idiosomal setae: vi 6–8, si 12–15, se, d1 30–35, c1, c2, and h1 —all 40–45, c3, h3, and ps3 —all 20–22, cp and e2 60–65, d2 48–52, e1 23–25, f2 8–9, h2 170–180, ps1–2 35–42, thickened, 1a–4a 15–18; lengths of selected leg solenidia v 1 I 16–18, v 3 I 50–55, v 1 II 20– 22, and w I, II 70–75.

Female ( Figures 7 , 8 ) (10 paratypes). Body, including gnathosoma, 390–410 long, 160– 165 wide. Gnathosoma 35 long, 25 wide. Prescapular shield 115–120 long. Postscapular shield 55–60 long, without ornamentation, bearing setae c1. Small longitudinal apodeme observable in median part of postscapular shield. Setae c1 situated on this shield. Hysteronotal shield 200–210 long, completely covered by 18–20 furrows. Lateral margins of hysteronotal shield extending on to ventral surface of hysterosoma, distance between ventral margins at level of setae ps3 15. Legs III and IV subequal, 70–75 long. Lengths of idiosomal setae: si and c3 12–15, sce and c2 17–20, c1 37–40, cp, d1, d2, and e1 —all 23–25, e2 30–32, f2, h1–3, ps1–3, 1a–4a, and g —all 10–13; selected leg solenidia: v 1 I–II 10–15, v 2 I 38–40, w I 22–25, and w II 18–20.

Remarks

The new species differs from H. baramensis by the following characters. In both sexes of H. chrotogale , the prescapular shield is without a transverse furrow; in males, setae e2 are about twice as long as e1, the cuticle between coxal fields II is not striated, the aedeagus is strongly reduced, genital setae are absent, coxal apodemes IV are fused to each other and with the progenital sclerite; in females, setae e2 at least twice as long as ps1–2. In both sexes of H. baramensis , the prescapular shield has a distinct transverse furrow; in males, setae e1 and e2 are subequal, the cuticle between coxal fields II is distinctly striated, the aedeagus is well developed, genital setae are present, coxal apodemes IV are separated from each other and from the progenital sclerite; in females, setae e2 are subequal to ps1–2 or slightly longer.

Etymology

The species name is derived from the generic name of the host and is a noun in apposition.

Figures

Figure 1. Hemigalichus chrotogale sp. nov., larva. (A) Lateral view; (B–D) legs I–III in ventral view, respectively. Abbreviations: c.f., clasping flap, l.i., lateral incision, l.t., lateral tooth, o.g., opening of oil gland, p.c., podocephalic canal, s.g., opening of supracoxal gland. Scale bars: 25 mm (A); 50 mm (B–D).

Figure 2. Hemigalichus chrotogale sp. nov., protonymph. (A) Dorsal view; (B) ventral view; (C) leg IV in ventral view. Scale bars: 25 mm (A, B); 50 mm (C).

Figure 3. Hemigalichus chrotogale sp. nov., teleonymph. (A) Ventral view; (B) coxa of leg II; (C) leg IV in ventral view. Abbreviations: fe, femur; ge, genu; ta, tarsus; ti, tibia; tr, trochanter. Scale bars: 100 mm (A); 50 mm (B, C).

Figure 4. Hemigalichus chrotogale sp. nov., homeomorphic male (holotype). (A) Dorsal view; (B) ventral view; (C) opisthosoma, ventral view. Abbreviations: i.a., internal apodeme; l. m., lobar membrane; l. r., longitudinal ridge; op. s., opisthogastric sclerite; t. l., terminal lobes. Scale bars: 100 mm (A, B); 50 mm (C).

Figure 5. Hemigalichus chrotogale sp. nov., details of homeomorphic male. (A) Chelicera in lateral view; (B) gnathosoma; (C) genital organ; (D–G) legs I–IV in ventral view, respectively. Abbreviations: a, aedeagus: a.p., antiaxial apophysis; chhd, cheliceral hood; chx, seta-like apophysis; d.a., post-dorsal apodeme; d.t., dorsal tooth; e, eupathidia; elc.p., supracoxal seta; f.d., fixed digit; g.c., genital capsule; g.p., genital papillae; l.p., lateral protrusion; m.d., movable digit; p.m., palpal membrane; p.s., progenital sclerite; s, spur; subc, subcapitular seta. Scale bars: 25 mm (A–C); 50 mm (D–G).

Figure 6. Hemigalichus chrotogale sp. nov., heteromorphic male in dorsal view.

Figure 7. Hemigalichus chrotogale sp. nov., female. (A) Dorsal view; (B) ventral view; (C) spermatheca. Abbreviations: b.c., basal cap; br.c., bursa copulatrix; i. c., inseminatory canal; o, ovipore; s.d., sperm duct. Scale bars: 100 mm (A, B); 50 mm (C).

Figure 8. Hemigalichus chrotogale sp. nov., details of female. (A–D) Legs I–IV in ventral view, respectively; (E) ovipore; (F) pretarsal ambulacarum, dorsal view. Abbreviations: a.s., ambulacral stalk; b.p., basilar piece; c, condylophore; c.g., condylophore guide; c.s., central sclerite; d.o., diachilous orifice; f, flap; f.s., fan-shaped structure; g.p., genital papilla; p.f., progenital fold; ps.f., posterogynal fold; u.l., undulate lamina.