Karschia (Karschia) latuis Fan, Zhang & Zhang, 2024, sp. nov.
Year: 2024
Type: other
Abstract: Karschia (Karschia) latuis sp. nov. Figures 1, 2A–E, 3–6, 11A, B. Type material. Holotype ♂ (MHBU-Sol-2024NMG-01), CHINA, Nei Monggol Autonomous Region, Alxa League, Alxa Left Banner, Helan Mountain National Nature Reserve, 39.6130°N, 105.7406°E, altitude 1637 m, 16.VI.2024, leg. Long Hao. Paratypes 1♂ (SWUC-Sol-TYPE-202401), 1♀ (SWUC-Sol-TYPE-202402), same data as holotype. 1♂ (MHBU-Sol-2024NMG-04), same locality of holotype, but 38.0249°N, 105.8904°E, altitude 1779 m, 2. VI.2024, leg. Long Hao; 1♀ (MHBU-Sol-2024NMG-05), same locality of holotype, but 38.8817°N, 105.6884°E, altitude 1513 m, 2. VI.2024, leg. Wenlong Fan; 1♂ (MHBU-Sol-2024NMG-06), same locality of holotype, but 38.8677°N, 105.7615°E, altitude 1740 m, 12. VI.2024, leg. Long Hao. Additional material examined. 5 juveniles (MHBU-Sol-2024NMG-07–11, same locality of holotype but 38.9727°N, 105.8492°E, altitude 1791 m, 21.VIII.2024, leg. Yutong Zhang. Etymology. The species-specific epithet is derived from the Latin word “latus”, meaning special wide triangular-shaped dorsal crest on male cheliceral fixed finger. Diagnosis. Males of Karschia (Karschia) latuis sp. nov. is here placed in the subgenus Karschia (Karschia) due to the lack of a dorsal cheliceral spine on the male fixed finger; instead, there is a low keel like Karschia (Karschia) kopetdaghica Gromov, 1998, and female possess triangular genital operculum, which cover the genital opening behind them, (Gromov 2003; Figs 4A–C; 6A–C). Karschia (Karschia) latuis sp. nov. differs from all other species in the genus by the presence of a special wide triangular-shaped dorsal crest on male cheliceral fixed finger (Fig. 4A, B; 6A, B). The new species can be further distinguished from other Karschia species by notches in the basal peg of flagellum (Figs 4C, 6C), and by the ctenidia on sternite IV broad, non-acicular (Figs 4F, 6E). Female genital operculum shape similar to Karschia (Karschia) birulae Roewer, 1934. However, it can be distinguished by the visibility of the genital opening, which located distal to the genital plates (Figs 5F, 6H). The genital operculum not heavily chitinized distally (Figs 5F, 6H). Description. Male (holotype). Measurements. Metric data as in Table 1. Radio: A/CP: 7.65; CL/ CH: 2.84. Colour (Figs 3A, B). Propeltidium color predominantly yellowish-brown, with yellowish median sulcus; ocular tubercle dark except for a median longitudinal light band. Chelicerae with manus predominantly bright yellow, with some black areas; limits between the setose and asetose areas often darkened; fingers reddish-brown, especially on the teeth. Meso-, metapeltidium and dorsal surface of opisthosoma yellowish-green, tergite color darkens. Ventral surface of opisthosoma yellowish-green, sternite color darkens. Ventral surface of prosoma uniformly faint yellow, sternum lighter than coxae. Pedipalps and legs yellow to brown; pedipalps progressively become darker towards the apex, such that the tarsus is nearly black. Malleoli whitish. Propeltidium (Fig. 3D). Propeltidium wider than long (i.e. ratio of PL/PW 0.75), with very thin, filiform setae and some bifurcated tip setae of different sizes perpendicular to the surface of the propeltidium; propeltidium with distinctly concave median sulcus. Ocular tubercle with four anterior medial spiniform setae, one central medial spiniform seta and two posteriors medial spiniform setae; the interocular distance slightly smaller than the length of the eyes. Cheliceral dentition and processes (Figs 3A, B, 6A, B). Fixed finger with median teeth series comprising three primary teeth (FP, FM and FD), graded as FP<FD
Authors: Fan, Wenlong, Zhang, Chao, Zhang, Feng
Institution: Hebei University
Language: English
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W6930515484
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