Bifurcia kangding Yang & Li & Yao 2024, sp. nov.
Creators: name: Yang, Lan
name: Li, Shuqiang
name: Yao, Zhiyuan
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Bifurcia
Bifurcia kangding

description: Bifurcia kangding sp. nov.
Figs 2, 3, 4, 16 A, D
Type material.
Holotype ♂ (IZCAS - Ar 44925) and paratypes 1 ♂ 2 ♀ (IZCAS - Ar 44926 –28), Mugecuo Scenic Area (30 ° 11.72 ' N, 101 ° 54.43 ' E, 3760 m elev.), Wangmu Village, Yala Town, Kangding, Garze Tibetan Autonomous Prefecture, Sichuan, China, 14 / 07 / 2004, Lihong Tu leg.
Etymology.
The specific name refers to the type locality; noun in apposition.
Diagnosis.
The new species resembles B. xiaojin sp. nov. with similar paracymbium (P) and epigyne (Figs 2 B, 3 A), but can be easily distinguished by embolus thumb (TH) with dentate end (Figs 2 B, 16 D vs. spinous, Figs 13 B, 16 J), by chitinized basal part of median membrane (CPM) small with tip end (Fig. 16 A vs. finger-shaped, Fig. 16 H), and by spermathecae (S) separated by diameter less than their inter-distance (Fig. 3 C vs. inter-distance less than their diameter, Fig. 14 C).
Description.
Male (holotype). Total length: 2.12, carapace 0.92 long, 0.74 wide, abdomen 1.30 long, 0.80 wide. Eye inter-distances and diameters: AME 0.06, AME-AME 0.03, ALE 0.08, AME-ALE 0.06, PME 0.08, PME-PME 0.05, PLE 0.07, and PME-PLE 0.06. Sternum 0.54 long, 0.52 wide. Clypeus 0.12 high. Chelicerae promargin with 3 teeth, retromargin with 4 teeth. Length of legs: I 5.50 (1.54, 0.28, 1.44, 1.34, 0.90), II 4.90 (1.26, 0.26, 1.44, 1.14, 0.80), III 3.10 (0.78, 0.22, 0.76, 0.76, 0.58), IV 4.44 (1.24, 0.24, 1.12, 1.10, 0.74). Leg formula: I-II-IV-III. TmI 0.16, TmIV absent. Tibial spine formula: 2-2 - 2 - 2. Carapace brown. Sternum dark brown. Abdomen with greenish gray dorsal spots (Fig. 4 A, B).
Palp (Fig. 2). Patella with long dorsal bristle. Tibia unmodified. Cymbium with hook-shaped proximal apophysis (PCA) pointing retrolaterally. Paracymbium (P) bifurcate with three branches: distally triangular branch, sharp-pointed branch and lower sclerotized branch. Pit hook (PH) on stout distal part of suprategulum (SPT) extremely reduced to small outgrowth. Embolic division (Fig. 16 A, D): anterior part of radix (APR) hook-shaped; sperm duct inside the radix (R) inconspicuous with Fickert’s gland (FG); pseudolamella (PL) strongly sclerotized and lamellar extension (LE) absent. Anterior terminal apophysis (ATA) short-pointing anterodorsally; median terminal apophysis (MTA) membranous with many slender branches; posterior terminal apophysis (PTA) with serrated margin. Embolus (E) with short basal part, apical part with conical embolus proper (EP), L-shaped thumb (TH), and sharp apex (AX). Median membrane (MM) leaf-shaped with numerous papillae, and basal part of median membrane chitinized (CPM).
Female (paratype). Total length: 2.42, carapace 0.94 long, 0.72 wide, abdomen 1.48 long, 1.10 wide. Eye inter-distances and diameters: AME 0.05, AME-AME 0.02, ALE 0.07, AME-ALE 0.05, PME 0.07, PME-PME 0.05, PLE 0.08, and PME-PLE 0.04. Sternum 0.56 long, 0.52 wide. Clypeus 0.12 high. Chelicerae promargin with 3 teeth, retromargin with 5 teeth. Length of legs: I 5.28 (1.44, 0.32, 1.34, 1.30, 0.88), II 4.74 (1.32, 0.30, 1.18, 1.14, 0.80), III 3.38 (1.02, 0.30, 0.80, 0.72, 0.54), IV 4.36 (1.26, 0.30, 1.06, 1.06, 0.68). Leg formula: I-II-IV-III. TmI 0.15, TmIV absent. Tibial spine formula: 2-2 - 2 - 2. Coloration generally as in male (Fig. 4 C, D).
Epigyne (Fig. 3). Basal part of scape (BS) nearly T-shaped. Posterior part of posterior median plate (PMP) M-shaped. Distal part of scape (DPS) forming a circle with basal part of scape. Spermathecae (S) round.
Distribution.
China (Sichuan, type locality; Fig. 1).
description: Published as part of Yang, Lan, Li, Shuqiang & Yao, Zhiyuan, 2024, Five new species of the spider genus Bifurcia Saaristo, Tu & Li, 2006 (Araneae, Linyphiidae) from Sichuan, China, pp. 705-720 in Zoosystematics and Evolution 100 (2) on pages 705-720, DOI: 10.3897/zse.100.124160