Hygrobates (Lurchibates) incognitus Goldschmidt & Nishikawa & Hiruta & Pfingstl & Jiang & Shimano 2021, sp. nov.
Creators: name: Goldschmidt, Tom
name: Nishikawa, Kanto
name: Hiruta, Shimpei F.
name: Pfingstl, Tobias
name: Jiang, Jian-Ping
name: Shimano, Satoshi
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Hygrobatidae
Hygrobates
Hygrobates incognitus

description: Hygrobates (Lurchibates) incognitus sp. nov. Goldschmidt, Nishikawa & Shimano
Material examined: Holotype female, slide mounted in glycerine jelly, preparation no. CIB INV 0023, parasitic on Paramesotriton guangxiensis (Amphibia, Caudata, Salamandridae); newt was collected in China, Guangxi Zhuang Autonomous Region, Ningming (mites were collected from unnumbered voucher specimens stored in the CIB collection, without detailed geographic information), preserved in 70% ethanol; mite was attached to the axilla and groin of the newt (CIB 200404064).
Paratypes: Two females CIB INV 0024, same newt specimen than holotype; CIB INV 0025, same collecting data, different newt specimen (CIB 200404060).
Distribution: All specimens of H. (L.) incognitus sp. nov. were collected from Paramesotriton guangxiensis. The new species is probably limited to the same distribution as its host (southern Guangxi, China and northeastern Cao Bang Province, Vietnam (Frost 2021)).
Derivatio nominis: incognitus (Latin = unknown, not visible, unexpected); referring to the fact that this species in the molecular analysis (28S) could not be separated from macrochela sp. nov..
Diagnosis: Coxal field relatively broad; gnathosoma anterior heavily curved; female genital plates broad kidney-shaped, flanking posterior 4/5 of genital opening; P-4 relatively slender, proximo-ventral extension of P-5 large, blunt cone-shaped; cheliceral claw relatively curved, slender.
Description, Male: Unknown.
Description, Female (n = 3): Idiosoma rounded-oval, L/W ratio 1.43 (1.40), L/W 1680 (1344)/1176 (960); fused anterior coxae of both sides elongated, triangular, Cx-I + II L/W 432 (360–400)/636 (564–582), ratio 0.68 (0.62–0.71), medio-posterior margin only slightly extended by secondary sclerotization, posteriorly convex, lateral extension straight, pointing postero-laterally, Cx-I basal width 228 (209–212); gnathosoma anteriorly heavily curved, broad, rounded tips far projecting, lateral margin with Cx-I posteriorly clearly converging (Fig. 30); anterior and posterior coxal groups laterally clearly separated, medially diverging; posterior coxae far separated, inclined heart-shaped, antero-medial margin curved, medial edges nose-shaped projecting, formed by Cx-IV only, Cx-IV nearly rectangular, posterior margin transverse, lateral margin convex (Fig. 30), posterior coxal groups (Cx-III + Cx-IV of one side) L/W 354 (318–322)/341 (294–306); genital field overall broad oval, acetabular plates broad kidney-shaped, slightly inclined to lateral, flanking 4/5 of genital opening, pre- and postgenitale laying completely under integument, genital field L/W 258 (234–252)/378 (336–342), single genital plate L/W 174 (178–188)/102 (92–94); acetabula of similar size, irregular oval, Ac-2 and Ac-3 laying beside each other, L/W Ac-1 76 (79–82)/43 (41–42), Ac-2 82 (82–85)/46 (41–48), Ac-3 89 (83–84)/40 (49–51), 18/20 (20/18, 20/22) setae of similar size on anterior, lateral and posterior margin of each plate, antero-medial of the plates 4/3 (2/3, 3/4), postero-medial 3/0 (0, 1/1) additional setae in the soft integument beside the pre- and postgenital sclerites (see Fig. 30); all legs slender, bearing many heavy setae, especially dorso-distally at basal segments (Figs. 31–35); measurements (L/H) of distal leg segments: I-leg-5 325 (322–325)/54 (54), I-leg-6 266 (240–258)/50 (49–50); II-leg-5 342 (342–346)/54 (54– 55), II-leg-6 276 (259–270)/54 (52–54); III-leg-5 378 (372–384)/56 (58–60), III-leg-6 312 (300–312)/54 (54–55); IV-leg-3 236 (236–242)/72 (67–68), IV-leg-5 396 (396–414)/58 (54), IV-leg-6 354 (342–355)/52 (53); chelicerae strong; cheliceral claws very large, curved, distally sharply pointed, dorsal margin in the distal half with strong serration continuing proximally in a lateral serration, medially and laterally striated (Figs. 36, 37); palps strong, relatively slender (Figs. 38–40), ventral margin of P-2 very slightly concave (sharp bend in Fig. 38 probably misshapen), antero-ventral corner with single denticles (in some specimens none), P-3 ventrally straight to slightly convex with loose field of denticles in distal 2/3, P-4 relatively long and slender, slightly curved, with a pair of ventral setae in the distal fourth; P-5 with a blunt, cone-shaped ventro-proximal projection, dorso-distally with a compact, denticle-like distal claw, distally with a pair of large, strong, similar, ventrally-buckled claws; mouthpart measurements: Chelicera H 151 (basal part in all specimens broken), claw L 261, curvation of cheliceral claw 26°; palp total L 617 (604–616), L/H P-1 71 (61–63)/87 (85–87), P-2 161 (165–169)/99 (96–101), P-3 122 (118–122)/87 (87–92), P-4 212 (204–212)/76 (63–68), P-5 52 (52–54)/45 (54–56).
description: Published as part of Goldschmidt, Tom, Nishikawa, Kanto, Hiruta, Shimpei F., Pfingstl, Tobias, Jiang, Jian-Ping & Shimano, Satoshi, 2021, Systematics, distribution and morphology of the newt parasitic water mites of the subgenus Lurchibates Goldschmidt & Fu, 2011 (Acari, Hydrachnidia Hygrobatidae, Hygrobates Koch, 1837), including the description of four new species and a key to all so far known species, pp. 1-36 in Zootaxa 4985 (1) on page 11, DOI: 10.11646/zootaxa.4985.1.1, http://zenodo.org/record/4929035