Bifurcia xiaojin 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 xiaojin

description: Bifurcia xiaojin sp. nov.
Figs 13, 14, 15, 16 H, J
Type material.
Holotype ♂ (IZCAS - Ar 44934) and paratypes 2 ♂ 3 ♀ (IZCAS - Ar 44935 –39), Changpinggou (31 ° 0.29 ' N, 102 ° 51.16 ' E), Siguniangshan National Scenic Area, Siguniangshan Town, Xiaojin County, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan, China, 01 / 08 / 2004, Lihong Tu leg.
Etymology.
The specific name refers to the type locality; noun in apposition.
Diagnosis.
The new species resembles B. kangding sp. nov. with similar paracymbium (P) and epigyne (Figs 13 B, 14 A), but can be distinguished by embolus thumb (TH) with spinous end (Figs 13 C, 16 H vs. dentate, Figs 2 C, 16 A), by chitinized basal part of median membrane (CPM) finger-shaped (Fig. 16 H vs. pointed, Fig. 16 A), and by spermathecae (S) close to each other (Fig. 14 C vs. widely separated, Fig. 3 C).
Description.
Male (holotype). Total length: 2.12, carapace 1.01 long, 0.99 wide, abdomen 1.11 long, 0.81 wide. Eye inter-distances and diameters: AME 0.05, AME-AME 0.02, ALE 0.06, AME-ALE 0.08, PME 0.06, PME-PME 0.06, PLE 0.07, and PME-PLE 0.08. Sternum 0.55 long, 0.53 wide. Clypeus 0.15 high. Chelicerae promargin with 2 teeth, retromargin with 1 tooth. Length of legs: I 5.49 (1.45, 0.31, 1.46, 1.38, 0.89), II 4.51 (1.22, 0.28, 1.17, 1.10, 0.74), III 3.29 (0.94, 0.25, 0.75, 0.77, 0.58), IV 4.34 (1.27, 0.27, 1.06, 1.02, 0.72). Leg formula: I-II-IV-III. TmI 0.17, TmIV absent. Tibial spine formula: 2-2 - 2 - 2. Carapace brown. Sternum dark brown. Abdomen with greenish gray dorsal spots (Fig. 15 A, B).
Palp (Fig. 13). Patella with long dorsal bristle. Tibia unmodified. Cymbium with hook-shaped proximal apophysis (PCA) pointing retrolaterally. Paracymbium (P) bifurcate with three curved branches. Pit hook (PH) on stout distal part of suprategulum (SPT) extremely reduced to small outgrowth. Embolic division (Fig. 16 H, J): anterior part of radix (APR) hook-shaped; sperm duct inside the radix (R) inconspicuous with Fickert’s gland (FG); pseudolamella (PL) strongly sclerotized, with distally angular end and lamellar extension (LE) absent. Anterior terminal apophysis (ATA) pointing anterodorsally; median terminal apophysis (MTA) membranous with four branches; posterior terminal apophysis (PTA) serrated. Embolus (E) with conical embolus proper (EP), short apex (AX), and thumb (TH) with a long thorn. Median membrane (MM) leaf-shaped with finger-shaped chitinized basal part (CPM).
Female (paratype). Total length: 2.22, carapace 1.04 long, 0.86 wide, abdomen 1.20 long, 0.92 wide. Eye inter-distances and diameters: AME 0.06, AME-AME 0.03, ALE 0.09, AME-ALE 0.06, PME 0.07, PME-PME 0.07, PLE 0.09, and PME-PLE 0.06. Sternum 0.58 long, 0.55 wide. Clypeus 0.15 high. Chelicerae promargin with 3 teeth, retromargin with 5 teeth. Length of legs: I 5.95 (1.60, 0.39, 1.58, 1.42, 0.96), II 4.93 (1.36, 0.33, 1.29, 1.17, 0.78), III 3.67 (1.09, 0.28, 0.84, 0.87, 0.59), IV 4.68 (1.45, 0.28, 1.11, 1.14, 0.70). Leg formula: I-II-IV-III. TmI 0.21, TmIV absent. Tibial spine formula: 2-2 - 2 - 2. Carapace yellowish-brown. Coloration generally as in male (Fig. 15 C, D).
Epigyne (Fig. 14). Basal part of scape (BS) long and sparsely clothed with long, curved hairs. Posterior part of posterior median plate (PMP) M-shaped. Distal part of scape (DPS) forming a circle with basal part of scape together. 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