Angaeus xieluae Liu, 2022

Liu, Ke-Ke, Ying, Yuan-hao, Fomichev, Alexander A., Zhao, Dan-chen, Li, Wen-hui, Xiao, Yong-hong & Xu, Xiang, 2022, Crab spiders (Araneae, Thomisidae) of Jinggang Mountain National Nature Reserve, Jiangxi Province, China, ZooKeys 1095, pp. 43-74 : 43

Angaeus xieluae Liu sp. nov.

Figs 1 , 2 , 3

Material examined.

Holotype: ♂, China: Jiangxi Province, Ji’an City, Jinggangshan County Level City , Jinggang Mountain National Nature Reserve , Eling Town , Tangnan Village , 26°43'8.4"N, 114°7'51.6"E, 289 m, 3.X.2015, K. Liu et al. leg . Paratypes: 1 ♀, Longshi Town , Huishi Park, 26°42'32.4"N, 113°56'49.2"E, 242 m, 2.V.2015, K. Liu et al. leg .; 1 ♂, Eling Town , Shenyuan Village, 26°43'26.4"N, 114°7'44.4"E, 277 m, 28.V.2015, K. Liu et al. leg .; 1 ♂, Huangao Town , Zhongqiuba, 4.IV.2015, K. Liu et al. leg .

Etymology.

The specific name is a matronym in honour of Miss Xie Lu from the College of Life Science, Jinggangshan University, who helped us in Longshi Town, where the paratype of the new species was collected.

Diagnosis.

The male of the new species resembles those of A. rhombifer Thorell, 1890, widely distributed in South-East Asia, in having embolus (E) with widened tip and retrolateral tibial apophysis (RTA) as long as tibia but can be distinguished from it by having embolus with bill-shaped tip and widened base and the median apophysis (MA) shifted retrolaterally (vs. embolus with narrow base and the median apophysis starting from the centre of the tegulum) (cf. Figs 1D , 2B, C and Benjamin 2013: fig. 2A). The female of A. xieluae sp. nov. also resembles that of A. rhombifer in having elongated comma-shaped spermathecae (SP) but can be separated from the latter by reduced septal stem (SS) and arcuate anterior hood (AH) spaced from spermathecae (vs. well-developed septal stem and horizontal anterior hood adjoining to spermathecae) (cf. Fig. 3C, D and Benjamin 2013: fig. 2D, E).

Description.

Male (holotype). Habitus as in Fig. 1A, B . Total length 6.22. Carapace: 2.70 long, 3.11 wide, anteriorly narrowed to 1.6, with abundant fluffy setae. Eye sizes and interdistances: AME 0.09, ALE 0.22, PME 0.11, PLE 0.19, AME-AME 0.16, AME-ALE 0.14, PME-PME 0.28, PME-PLE 0.28, AME-PME 0.29, AME-PLE 0.54, ALE-ALE 0.64, PLE-PLE 1.0, ALE-PLE 0.26; MOA 0.45 long, front width 0.33, back width 0.51. Sternum (Fig. 1B ) oval, with notch anteromedially. Abdomen (Fig. 1A, B ): 3.58 long, 3.67 wide. Leg measurements: I 13.33 (4.22, 1.58, 3.88, 2.44, 1.21); II 13.56 (4.34, 1.59, 4.11, 2.38, 1.14); III 5.99 (1.86, 0.83, 1.48, 1.06, 0.76); IV 6.82 (2.15, 0.94, 1.57, 1.43, 0.73). Leg spination: I Fe: d4, p5, r4; Ti: p2, r2, v8; Mt: p2, r2, v6; II Fe: d10; Ti: p2, r2, v7; Mt: p3, r3, v4; III Fe: d2, p2, r2; Ti: p2, r1, v2; Mt: d2, v4; IV: Fe: d2; Ti: p2, r1, v2; Mt: d2, v2.

Colouration. Carapace reddish brown. Chelicerae dark brown. Endites and labium reddish brown. Sternum yellow. Legs yellow brown, with several dark spots near bases of setae; legs III and IV paler, with pale and dark colours. Abdomen reddish brown, medially with arch-shaped dark mark.

Palp (Figs 1C-E , 2 ). Femur 2 × longer than patella. Patella slightly shorter than tibia. Retrolateral tibial apophysis (RTA) large, as long as tibia, with thick and swollen base and ventral tibial apophysis, apex of RTA gradually pointed, directed dorsally. Cymbium drop-shaped, 2 × longer than wide. Tegulum oval, median apophysis (MA) spoon-shaped, extending from subcentre to 1 o’clock position, with a small hook-like apex. Sperm duct (SD) U-shaped, gradually tapering, arising at 1 o’clock position. Conductor (C) partly hidden by embolus, located close to the apex of median apophysis. Base of the embolus (Eb) ~ 3 × wider than the median apophysis. Embolus with clear sperm groove (Gr).

Female. Habitus as in Fig. 3A, B . Total length 8.07. Carapace: 3.56 long, 3.51 wide, anteriorly narrowed to 0.6 × of its maximum width. Eye sizes and interdistances: AME 0.08, ALE 0.19, PME 0.11, PLE 0.18, AME-AME 0.25, AME-ALE 0.15, PME-PME 0.29, PME-PLE 0.30, AME-PME 0.34, AME-PLE 0.52, ALE-ALE 0.71, PLE-PLE 1.00, ALE-PLE 0.23. MOA 0.56 long, front width 0.39, back width 0.52. Abdomen (Fig. 3A, B ): 4.51 long, 4.16 wide, with abundant depressed patches. Leg measurements: I 11.99 (3.70, 1.42, 3.53, 2.20, 1.14); II 11.95 (3.78, 1.48, 3.44, 2.20, 1.05); III 5.81 (1.87, 0.78, 1.36, 1.10, 0.7); IV 6.74 (2.16, 0.86, 1.63, 1.34, 0.75). Leg spination: I Fe: d6, p1; Ti: p2, r2, v8; Mt: p3, r3, v4; II Fe: d6; Ti: p1, v2; Mt: p3, r3, v4; III Fe: d2; Ti: p1, v2; Mt: d2, p1, v4; IV: Fe: d2; Ti: p1, r1, v2; Mt: d2, p1, r1, v2.

Colouration as in Fig. 3A, B . Carapace reddish brown. Chelicerae dark brown. Endites and labium reddish brown. Sternum reddish brown. Legs yellow brown, with several dark spots near bases of setae; legs III and IV paler, with pale and dark colours. Abdomen yellow brown, subposteriorly with arch-shaped dark mark.

Epigyne (Fig. 3C, D ). Anterior hood (AH) arcuate. Atrium (At) oval, 1.5 × wider than long, with several transverse wrinkles. Copulatory openings (CO) clearly visible, located within posteromedian part of the atrium. Epigynal teeth (ET) robust and blunt, inclined posteriorly. Septal stem (SS) round and convex. Spermathecae (SP) 2.5 × longer than wide, with several distinct constrictions, separated in the anterior part by 1.5 × their width and closely spaced in the posterior part. Copulatory ducts (CD) shorter than the spermathecae width. Fertilisation ducts (FD) nearly as long as 1/2 spermathecal length.

Distribution.

Known only from the type locality in Jiangxi Province of China (Fig. 17 ).

Figures

Figure 1. Angaeus xieluae sp. nov., male holotype. A habitus, dorsal view B same, ventral view C palp, prolateral view D same, ventral view E same, retrolateral view. Abbreviations: C - conductor, E - embolus, Eb - base of the embolus, MA - median apophysis, RTA - retrolateral tibial apophysis, SD - sperm duct. Scale bars: 0.5 mm (A, B), 0.1 mm (C-E).

Figure 2. SEM micrographs of Angaeus xieluae sp. nov. male palp (holotype). A prolatero-ventral view B ventral view C same, details of bulb D same, details of retrolateral tibial apophysis E retrolateral view F retrolateral view, slightly dorsal G same, details of embolus. Abbreviations: C - conductor, E - embolus, Eb - base of the embolus, Gr - groove, MA - median apophysis, RTA - retrolateral tibial apophysis. Scale bars: 0.1 mm (A-C, E, F), 20 μm (D, G).

Figure 3. Angaeus xieluae sp. nov., female paratype. A habitus, dorsal view B same, ventral view C epigyne, ventral view D same, dorsal view. Abbreviations: AH - anterior hood, At - atrium, CD - copulatory duct, CO - copulatory opening, ET - epigynal teeth, FD - fertilisation duct, SP - spermatheca, SS - septal stem. Scale bars: 0.5 mm (A, B), 0.1 mm (C, D).

Figure 17. The location of the Jinggang Mountain National Nature Reserve in China indicated by a large black dot.