Apochinomma medog, Zhang & Zhang, 2023

Zhang, Lu & Zhang, Feng, 2023, First report of the genus Apochinomma Pavesi, 1881 from China, with description of a new species (Araneae, Corinnidae, Castianeirinae), Zootaxa 5323 (3), pp. 446-450 : 446-449

Apochinomma medog sp. nov. (MffiȐĦ)

Figs 1‒2

Type material. Holotype ♁ (HBUARA#2022-018), CHINA: Tibet, Motuo County, Motuo Town (29.296265°N, 95.280296°E, Alt. 800.44m), 30.V.2022, leg. Bo Liu, MHBU . Paratypes: 1♀, same data as holotype ; 1♀ (XZMT-18- 72), CHINA: Tibet, Motuo County, Yarang Village (29°17.758′N, 95°16.827′E, Alt. 761m), 28.VI.2018, leg. Luyu Wang, MHBU .

Etymology. The specific name refers to the type locality.

Diagnosis. The new species morphologically resembles A. formicaeformis Pavesi, 1881 in genital characteristics, but can be distinguished from the latter by: 1) the straight embolus tip (vs the curved embolus tip in A. formicaeformis ) (cf. Fig. 2B–C with fig. 10A–B in Haddad 2013); 2) middle spermathecae separated (vs middle spermathecae contiguous in A. formicaeformis ) (cf. Fig. 2D–E with fig. 10C–D in Haddad 2013). In addition, this new species morphologically resembles A. nitidum , but can be distinguished from the latter by: 1) the short embolus with thick tip (vs long embolus with slender and cambered tip in A. nitidum ) (cf. Fig. 2A–C with fig. 483 in Deeleman-Reinhold, 2001); 2) copulatory ducts transverse, curved (vs middle with loop in A. nitidum ) (cf. Fig. 2E with fig. 486 in Deeleman-Reinhold, 2001).

Description. Male (holotype) ( Fig. 1A–D ): TL 6.55; CL 3.55, CW 2.03; AL 3.89, AW 2.14. Eye sizes and interdistances: AME 0.53, ALE 0.32, PME 0.35, PLE 0.30; AME–AME 0.83, AME–ALE 0.68, ALE–ALE 2.15, PME– PME 1.33, PME–PLE 1.41, PLE–PLE 3.25, ALE–PLE 1.22; CW: AERW = 2.60: 1; CW: PERW = 1.61: 1; MOA 0.18 long; anterior width 0.23, posterior width 0.33. Clypeal height 0.20. Measurements of legs: I 5.71 (1.55, 0.44, 1.47, 1.34, 0.91), II 5.12 (1.37, 0.37, 1.37, 1.21, 0.80), III 5.11 (1.34, 0.50, 1.24, 1.31, 0.72), IV 7.38 (2.06, 0.61, 1.76, 2.04, 0.91). Carapace black, elongate oval, with short and narrow fovea. Sternum black, shield-shaped and surface with white, sparse plumose hair. Abdomen oval, laterally constricted, posteriorly gradually widened; dorsum black, anteriorly with short and cylindrical collar. Dorsal scutum large, nearly covered abdomen. Venter with deep red-brown rectangular ventral sclerite; inframamillary sclerite red-brown, subtriangular.

Palp ( Fig. 2A–C ). Tibia with an apophysis in ventral surface. Tegulum pear-shaped, yellow-brown, with black insemination. Embolus short, with single coil, basal section broad; embolus tip obviously tapering and weakly curved, directed prolaterally.

Female (paratype) ( Fig. 1E, F ): TL 6.74; CL 3.31, CW 1.90; AL 3.43, AW 2.74. Eye sizes and interdistances: AME 0.41, ALE 0.32, PME 0.27, PLE 0. 22; AME–AME 0.68, AME–ALE 0.46, ALE–ALE 1.55, PME–PME 0.98, PME–PLE 0. 94, PLE–PLE 2.69, ALE–PLE 1.03; CW: AERW = 2.57: 1; CW: PERW = 1.65: 1; MOA 0.16 long; anterior width 0.40, posterior width 0.52. Clypeal height 0.20. Measurements of legs: I 7.43 (1.99, 0.57, 2.00, 1.68, 1.19), II 6.96 (1.91, 0.55, 1.86, 1.60, 1.04), III 6.29 (1.70, 0.54, 1.60, 1.54, 0.91), IV 9.18 (2.60, 0.74, 2.27, 2.54, 1.03). Other characteristics as in the male, except dorsal scutum extending about half the length of abdomen and without ventral sclerite.

Epigyne ( Fig. 2D, E ). Copulatory openings oblique and situated laterally in posterior of epigastric plate. Copulatory ducts transverse, curved and extended into spermathecae. Fertilization duct thin, short, lying the secondary spermathecae. Anterior spermatheca globular, adjacent; posterior spermathecae slender, tubular, separated.

Distribution. China (Xizang Autonomous Region).

Figures

FIGURE 1. Apochinomma medog sp. nov.: A. male habitus, dorsal view; B. same, ventral view; C. male eyes, dorsal view; D. male eyes and chelicerae, front view; E. female habitus, dorsal view; F. same, ventral view. Scale bar: 2 mm (A–B, E–F); 0.5 mm (C–D).

FIGURE 2. Apochinomma medog sp. nov.: A. male left palp, prolateral view; B. same, ventral view; C. same, retrolateral view; D. epigyne, ventral view; E. vulva, dorsal view. Scale bar: 0.20 mm (A–C); 0.1mm (D–E).