Clubiona tixing Yu & Li, 2021

Zhang, Jianshuang, Yu, Hao & Li, Shuqiang, 2021, Taxonomic studies on the sac spider genus Clubiona (Araneae, Clubionidae) from Xishuangbanna Rainforest, China, ZooKeys 1034, pp. 1-163 : 1

Clubiona tixing Yu & Li sp. nov. Figs 18 , 73D , 81D , 89D

Holotype

♀ (IZCAS-Ar 34750), China: Yunnan Province: Xishuangbanna: Jinghong City: Nabanhe Natural Reserve, Mandian Waterfall, monsoon forest, 22°7.845'N, 100°39.749'E, ca. 736 m, 22.VIII.2012, G. Zheng leg.

Etymology.

The specific name is derived from the Chinese pinyin tī xíng, which means ‘trapezoid’, referring to the trapezoidal atrium; noun in apposition.

Diagnosis.

Females of this species resemble those of C. zhangmuensis ( Zhang et al. 2007: 38, figs 7-8) in having a similar atrium and endogyne but can be recognised by the presence of an atrial membrane (Figs 18A-C , 73D , 81D ) (vs. absent; Zhang et al. 2007: 38, fig. 7).

Description.

Female. Holotype (Fig. 18F, G ): Total length 6.62; carapace 2.80 long, 2.02 wide; opisthosoma 3.82 long, 2.28 wide. Carapace brown in alcohol, uniformly coloured, without distinct pattern, ocular region distinctly narrowed, cervical groove and radial grooves indistinct; tegument smooth, clothed with short setae. Eyes: in dorsal view, both AER and PER almost straight, the former narrower than the latter. Eye sizes and interdistances: AME 0.14, ALE 0.15, PME 0.14, PLE 0.12, AME-AME 0.12, AME-ALE 0.13, PME-PME 0.39, PME-PLE 0.24, MOQL 0.43, MOQA 0.41, MOQP 0.67. Chelicerae robust and dark brown, with five promarginal and three retromarginal teeth. Sternum yellowish brown, darker marginally, 1.63 long, 1.00 wide. Labium and endites coloured as carapace. Legs uniformly yellowish white. Leg measurements: I - (1.71, 2.25, -, -), II - (1.78, 2.42, -, -), III - (1.60, 1.88, -, -), IV - (2.11, 2.55, 1.17, -). Abdomen elongate-oval, uniformly pale brown, with numerous brown spots; dorsally with a lengthwise white heart mark, reaching posterior half, with two pairs of muscle depressions located at lateral part of heart mark; venter medially with four longitudinal dotted lines.

Epigyne (Figs 18A-E , 73D , 81D , 89D ). Epigynal plate distinctly wider than long, margin not rebordered, spermathecae and bursae are indistinctly visible through epigynal plate in ventral view. Atrium large, more or less rectangular or trapezoidal, ca. 1.3 × wider than long, ca. 1/3 of epigyne length, with tongue-shaped membrane on anterior margin, posterior atrial border not delimited. Copulatory openings indistinct, located at anterolateral atrial borders. Copulatory ducts short, bent dorsally and ascend obliquely to connect with bursae. Spermathecae convoluted, anteriorly situated, spermathecal heads thick. Bursae reniform, close together, ca. 1.6 × longer than wide, surface translucent and wrinkled.

Male. Unknown.

Distribution.

Known only from the type locality, Xishuangbanna, Yunnan, China.

Figures

Figure 18. Holotype female of Clubiona tixing sp. nov., epigyne (A-E) and habitus (F, G) A intact, ventral view B cleared, ventral view C cleared, ventral view D cleared, dorsal view E cleared, dorsal view F dorsal view G ventral view. Abbreviations: A = atrium; AM = atrial membrane; BS = bursa; CD = copulatory duct; CO = copulatory opening; FD = fertilisation duct; SH = spermathecal head; SP = spermatheca. Scale bars: 0.2 mm (equal for A-E); 1 mm (equal for F, G).

Figure 73. Clubiona spp. of the C. corticalis group, epigyne, intact, ventral view A C. cochlearis B C. dengpao sp. nov., holotype C C. yejiei sp. nov., holotype D C. tixing sp. nov., holotype E C. subrama F C. zhigangi sp. nov., paratype. Abbreviations: A = atrium; AM = atrial membrane; CO = copulatory opening. Scale bars: 0.2 mm.

Figure 81. Clubiona spp. of the C. corticalis group, epigyne, cleared, ventral view A C. cochlearis B C. dengpao sp. nov., holotype C C. yejiei sp. nov., holotype D C. tixing sp. nov., holotype E C. subrama F C. zhigangi sp. nov., paratype. Abbreviations: A = atrium; AM = atrial membrane; CO = copulatory opening. Scale bars: 0.2 mm.

Figure 89. Clubiona spp. of the C. corticalis group, vulva, cleared dorsal view A C. cochlearis B C. dengpao sp. nov., holotype C C. yejiei sp. nov., holotype D C. tixing sp. nov., holotype E C. subrama F C. zhigangi sp. nov., paratype. Abbreviations: BS = bursa; CD = copulatory duct; FD = fertilisation duct; SH = spermathecal head; SP = spermatheca. Scale bars: 0.2 mm.