Orchestina colubrina Liu, Henrard & Xu, 2019

Liu, Keke, Henrard, Arnaud, Xiao, Yonghong & Xu, Xiang, 2019, On three new oonopid species from China and the discovery of the male Orchestina bialata Liu, Xiao & Xu, 2016 (Araneae: Oonopidae), Zootaxa 4701 (3), pp. 235-256 : 246-249

Orchestina colubrina Liu, Henrard & Xu , sp. nov.

( Figures 10 , 11 , 16)

urn:lsid:zoobank.org:act:008A093C-3F06-432E-9EF3-BBC66B7213CA

Type material: Holotype: female: China, Jiangxi Province: Ji’an City, Jinggangshan County Level City , Ciping Town , Xingzhou Village , forest, 26.519°N, 114.193°E, 514m, 3.X.2015, Keke Liu, Zeyuan Meng, Lei Zhang, Jianyun Wen and Tianming Wang leg. ( OON 75 ) . Paratype: 1 female, collected together with the holotype ( OON 76 ) .

Etymology: The specific name is a Latin adjective, referring to the slender snake-like sclerite in the posterior medial part of the anterior uterine sclerite (AUS) ( Fig. 10G ).

Diagnosis: Females of Orchestina colubrina resemble to those of O. cornuta Henrard & Jocqué, 2012 , and O. yinggezui Tong & Li, 2011 in having the long lateral extensions (Ex) surrounding anterior uterine sclerite (AUS) ( Fig. 10G ) (see Henrard & Jocqué 2012: figs 147−150; Tong & Li 2011, fig. 10A, B), but can be clearly distin- guished ( Fig. 10D , F−H) by the PLE almost touching the PME (separate in O. cornuta and O. yinggezui: Henrard & Jocqué 2012 : fig. 140; Tong & Li 2011: fig. 1I) and by the genitalia with narrow quadrangular AUS having inconspicuous lateral protrusions and serpentiform median sclerite (narrow hoop and widened median sclerite in O. cornuta: Henrard & Jocqué 2012 : fig. 150; circular protrusions and clavate median sclerite in O. yinggezui: Tong & Li 2011 : fig. 5H).

Description: Female holotype. Habitus as in Fig. 10A, B . Total length 1.30, carapace ( Fig. 10A, C, E ) yellowish white, length 0.60, width 0.40, oval in dorsal view (CW/CL ≈ 0.72), anteriorly narrowed to 0.5 times its maximum width, pars cephalica elevated in lateral view, dorsally with sparse trichopores and few tiny sepia spots forming net-shaped pattern. Eyes ( Figs 10A, C, D , 11A ): diameters: ALE 0.10, PME 0.10, PLE 0.10; PME almost circular, touching, ALE−PME touching, ALE−PLE touching, PLE−PME separated from less than PME’s radius. Clypeus ( Figs 10C, D , 11A, B ) margin unmodified, anteriorly slightly curved downwards in frontal view, corners with a group of 4 setae in front of ALE. Sternum ( Figs 10E , 11C ) surface smooth, slightly longer than wide, shield shaped with angulate anterior corners, with sparse setae except medially, yellowish-white with dark strip on median part, and tiny dark spots around margins. Mouthparts ( Figs 10C, E , 11 B−F): Chelicerae yellowish-white, straight, slightly divergent apically, dorsally with few scattered, long setae, more numerous on inner margin, each base of fangs with long and fine setae; labium yellow, spade-shaped but with rounded apical part, anterior margin slightly indented, with 7 strong setae, middle part with 8 needle-like setae including 2 setae in center and two groups of 3 setae in lateral part; endites ( Figs 10E , 11C, D ) rectangular, almost parallel, serrula conspicuous in single row, inner margin with abundant, short, flattened setae. Abdomen ( Fig. 10B ) oval, length 0.69, width 0.50, soft portions of dorsum pale yellow, with gray netlike pattern in dorsal view; pedicel tube short, unmodified. Book lung small, round. Spinnerets yellow, cylindrical, with abundant setae in dorsal view. Legs yellow, femur IV thickened, wider than femora I−III. Genitalia ( Fig. 10 F−H): in ventral view, posteriorly with recurved slit; in dorsal view, clearly with two long lateral extensions (Ex) surrounding anterior uterine sclerite (AUS); Ex with wide distal part, itself with few indentations, AUS central dark, almost quadrangular with lateral margins slightly converging posteriorly, medially with cylindrically serpentiform sclerite; receptaculum not visible in our sample but probably fused at base of AUS.

Male: Unknown.

Distribution: Only known from Jiangxi Province ( Fig. 16 ).

Figures

FIGURE 10A–H. Orchestina colubrina sp. nov., female paratype (OON 75). A. Carapace, dorsal view. B. Abdomen, dorsal view. C. Carapace, frontal view. D. Eyes and clypeus, frontal view. E. Carapace, ventral view. F. Genitalia, observed in 100% alcohol, ventral view. G. As previous, observed in 85−90% lactic acid, ventral view. H.As previous, dorsal view. Abbreviations: AUS, anterior uterine sclerite, Ex, dorsolateral extension, Sc, sclerite. Scale bars: A−F, 0.1 mm; G, H, 50 µm.

FIGURE 11A–F. Orchestina colubrina sp. nov., female paratype (OON 75). A. Carapace, frontal view, the white arrows show the clypeus with two groups of 4 setae on laterally rounded corners near ALE. B. Detail of chelicerae, frontal view. C. Carapace, ventral view. D. Mouthparts, ventral view. E. Labium, ventral view, stars indicate the middle part with 8 needle-like setae including 2 setae in center and two groups of 3 setae in lateral part. F. Fang, ventral view, the white arrow shows the feather-like setae at the base. Scale bars: A, B, D−F, 10 µm; C, 20 µm.

FIGURE 16. Collection localities for Ischnothyreus tergeminus sp. nov., Orchestina colubrina sp. nov., O. bialata Liu, Xiao & Xu, 2016 and O. zhiwui sp. nov. in China.