Clubiona subdidentata 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 subdidentata Yu & Li sp. nov. Figs 15 , 74F , 82F , 90F

Holotype.

♀ (IZCAS-Ar 34749), China: Yunnan Province: Xishuangbanna: Mengla County: Xiaolongha Village: 22°5.017'N, 100°22.084'E, ca. 1118 m, 24.VII.2012, Q.Y. Zhao and Z.G. Chen leg. Other material examined. 1♀ (YHCLU0073), same data as holotype

Etymology.

The specific name is taken from its similarity to C. didentata ; adjective.

Diagnosis.

The female of C. subdidentata sp. nov. can be distinguished from all other members of the C. corticalis group with the exception of C. didentata ( Yu and Li 2019b: 207, figs 6A-D; Figs 74E , 82E , 90E ) by having an atrial membrane (atrial membrane is absent in almost all species of the Clubiona corticalis group) and similar vulva but can be recognised by the nearly equilateral triangular atrial membrane (Figs 15A-C , 74F , 82F ) (vs. tongue- shaped in C. didentata ; Figs 74E , 82E ) and by the distinct copulatory ducts (Figs 15D, E , 90F ) (copulatory ducts absent in C. didentata ; Fig. 90E ).

Description.

Female. Holotype (Fig. 15F, G ): Total length 3.63; carapace 1.45 long, 1.14 wide; opisthosoma 2.18 long, 1.32 wide. Carapace uniformly greyish white, without any pattern or markings; ocular region distinctly narrowed, cervical groove and radial grooves indistinct; tegument smooth, all setae detached in ethanol. Eyes: AER slightly recurved, PER wider than AER and almost straight in dorsal view. Eye sizes and interdistances: AME 0.09, ALE 0.09, PME 0.09, PLE 0.07, AME-AME 0.06, AME-ALE 0.07, PME-PME 0.19, PME-PLE 0.10, MOQL 0.21, MOQA 0.23, MOQP 0.38. Chelicerae light orange, with three promarginal and two retromarginal teeth. Sternum pale brown, 0.80 long, 0.65 wide. Labium and endites coloured as chelicerae. Legs greyish white, uniformly coloured. Leg measurements: I 2.73 (0.81, 1.15, 0.55, 0.23), II 3.15 (0.93, 1.25, 0.74, 0.22), III 2.85 (0.93, 0.95, 0.70, 0.29), IV 3.39 (1.19, 1.32, 1.05, 0.39). Abdomen oval, nearly pure white, with inconspicuous anterior setal tufts, dorsum with two pairs of inconspicuous muscle depressions; venter without pattern.

Epigyne (Figs 15A-E , 74F , 82F , 90F ). Epigynal plate ca. 1.5 × wider than long, margin not delimited; spermathecae and bursae prominently visible through epigynal plate. Atrium small, anteriorly covered by an atrial membrane. Atrial membrane shaped nearly like an equilateral triangle, with a blunt apex. Copulatory openings small, located at basolateral atrial borders. Copulatory ducts distinct, extend transversally, connecting to posteriorly located bursae. Spermathecae small, consisting of a bean-shaped proximal part and an acicular distal part, with short fertilisation ducts terminally. Bursae reniform, close together, ca. 1.3 × longer than wide, bursal surface hyaline and smooth, inside pigmented and sclerotised.

Male. Unknown.

Distribution.

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

Figures

Figure 15. Holotype female of Clubiona subdidentata 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: AM = atrial membrane; BS = bursa; CD = copulatory duct; CO = copulatory opening; FD = fertilisation duct; SP = spermatheca. Scale bars: 0.1 mm (equal for A-E); 1 mm (equal for F, G).

Figure 74. Clubiona spp. of the C. corticalis group, epigyne, intact, ventral view A C. xiaokong sp. nov., holotype B C. zhaoi sp. nov., holotype C C. kai D C. tiane E C. didentata F C. subdidentata sp. nov., holotype. Abbreviations: A = atrium; AM = atrial membrane; CO = copulatory opening. Scale bars: 0.2 mm.

Figure 82. Clubiona spp. of the C. corticalis group, epigyne, cleared, ventral view A C. xiaokong sp. nov., holotype B C. zhaoi sp. nov., holotype C C. kai D C. tiane E C. didentata F C. subdidentata sp. nov., holotype. Abbreviations: A = atrium; AM = atrial membrane; CO = copulatory opening. Scale bars: 0.2 mm.

Figure 90. Clubiona spp. of the C. corticalis group, vulva, cleared, dorsal view A C. xiaokong sp. nov., holotype B C. zhaoi sp. nov., holotype C C. kai D C. tiane E C. didentata F C. subdidentata sp. nov., holotype. Abbreviations: BS = bursa; CD = copulatory duct; FD = fertilisation duct; SH = spermathecal head; SP = spermatheca. Scale bars: 0.2 mm.