Clubiona bidactylina, Wu & Chen & Zhang, 2023

Wu, Panlong, Chen, Yang & Zhang, Feng, 2023, Three new species of the Clubiona corticalis group (Araneae, Clubionidae) from China, ZooKeys 1157, pp. 163-176 : 163

Clubiona bidactylina sp. nov.

Figs 1 , 2

Type material.

Holotype: China • ♂; Tibet, Zayu County (28°39.59'N, 97°27.96'E, 2323 m elev.), 25 June 2018, Yannan Mu leg. Paratypes: • 2♀, same data as the holotype.

Etymology.

The specific name is the combination of the bi - (two) and dactylina (finger-shaped), referring to two finger-shaped apophyses on the femur; adjective.

Diagnosis.

The new species resembles C. pianmaensis Wang, Wu & Zhang, 2015 ( Wang et al. 2015: figs 1-14), but it differs by the presence of femoral ventral apophysis (vs. absent), 2 retrolateral tibial apophyses (vs. 1), the wider embolic base (embolic base width/genital bulb width ratio 0.4 vs. 0.2), conductor extended to the middle part of embolus (vs. tip of embolus), the smaller copulatory openings (copulatory opening width/interdistance ratio 0.2 vs. 4.7), and the boot-shaped bursae (vs. almost spherical).

Description.

Male (Fig. 1B ). Total length 4.11: carapace 2.04 long, 1.44 wide; abdomen 2.16 long, 1.31 wide. Carapace yellowish brown. Eye sizes and interdistances: AME 0.08, ALE 0.11, PME 0.10, PLE 0.12; AME-AME 0.09, AME-ALE 0.04, ALE-ALE 0.34, PME-PME 0.22, PME-PLE 0.12, PLE-PLE 0.66, ALE-PLE 0.11. MOA 0.23 long, front width 0.27, back width 0.42. Clypeus height 0.05. Chelicerae yellow brown, promargin with 4 teeth, retromargin with 3 teeth. Endites paler than chelicerae. Labium yellow-brown, 0.31 long, 0.24 wide. Sternum 1.07 long, 0.62 wide. Abdomen oval, light yellow, with conspicuous anterior tufts of setae. Legs, yellow, except tarsi and metatarsi yellowish brown, both tibia I and II with two pairs of ventral spines, both metatarsi I and II with 1 pair of ventral spines. Leg measurements: I 4.25 (1.25, 0.59, 1.09, 0.84, 0.48), II 5.01 (1.46, 0.67, 1.35, 1.00, 0.53), III 3.87 (1.15, 0.58, 0.79, 0.97, 0.38), IV 5.58 (1.62, 0.63, 1.29, 1.55, 0.49). Leg formula: 4-2-1-3.

Palp (Figs 1E-G , 2A-C ). Femur length/width ratio 2.9, modified, with 2 apophyses, retrolateral apophysis digitiform, located medially, ventral apophysis transparent, located distally. Patella length/width ratio 1.5, unmodified. Tibia as long as wide, with 2 retrolateral apophyses, wedge-shaped apophysis located distally, with a small, triangular process at base in retrolateral view, digitiform apophysis located proximally. Cymbium length/femur length ratio 1.2. Cymbium length/width ratio 2.3, oblong. Tegulum uninflated, sperm a-shaped in ventral view. Conductor lance-shaped in ventral view, extended to the middle part of embolus. Embolus with wide base, embolic base width/genital bulb width ratio 0.4, the upper third sharply pointed and extended towards tip of cymbium.

Female (Fig. 1A ). Total length 4.71-4.79; body length 4.79: carapace 2.04 long, 1.48 wide; abdomen 2.79 long, 1.83 wide. Eye sizes and interdistances: AME 0.08, ALE 0.11, PME 0.09, PLE 0.11; AME-AME 0.11, AME-ALE 0.04, ALE-ALE 0.36, PME-PME 0.23, PME-PLE 0.15, PLE-PLE 0.71, ALE-PLE 0.10. MOA 0.23 long, front width 0.27, back width 0.43. Clypeus height 0.05. Labium 0.30 long, 0.26 wide. Sternum 1.11 long, 0.74 wide. Leg measurements: I 3.52 (1.05, 0.56, 0.82, 0.66, 0.43), II 3.92 (1.18, 0.63, 0.92, 0.76, 0.43), III 3.35 (1.02, 0.44, 0.72, 0.81, 0.36), IV 5.19 (1.49, 0.72, 1.16, 1.40, 0.42). Leg formula: 4-2-1-3. Other characters as in male.

Epigyne (Figs 1C, D , 2D, E ). Epigynal plate length/width ratio 0.9, the anterior part membranous, with 2 semicircular hoods. Copulatory openings small and circular, located medially, width/interdistance ratio 0.2. Copulatory ducts almost straight, descended obliquely, then connected with boot-shaped bursae. Bursae situated posteriorly, length/width ratio 1.6. Spermathecae tubular, almost located at the middle position between copulatory openings and bursae. Fertilisation ducts short and lance-shaped, located on dorsal-lateral surface of spermathecae.

Distribution.

Known only from the type locality.

Figures

Figure 1. Clubiona bidactylina sp. nov. A female habitus B male habitus C epigyne, ventral view D vulva, dorsal view. Left male palp: E ventral view F prolateral view G retrolateral view. Scale bars: 1 mm (A, B); 0.1 mm (C, D); 0.2 mm (E-G).

Figure 2. Clubiona bidactylina sp. nov. Left male palp: A prolateral view B retrolateral view C ventral view D epigyne, ventral view E vulva, dorsal view. Scale bars: 0.5 mm (A-C); 0.1 mm (D, E).