Peng birmanicus (Thorell, 1897) Lu & Chu & Lin & Pham & Li & Yao, 2023

Lu, Ying, Chu, Chang, Lin, Zixuan, Pham, Dinh-Sac, Li, Shuqiang & Yao, Zhiyuan, 2023, Two new genera and five new species of Corinnidae Karsch, 1880 (Arachnida, Araneae) from China and Vietnam, ZooKeys 1165, pp. 17-42 : 17

Peng birmanicus (Thorell, 1897) comb. nov.

Figs 9 , 10 , 11

Myrmecisca birmanica Thorell, 1897: 240; Sphecotypus birmanicus Simon 1897: 171; Yamasaki et al. 2017: 22, figs 1-5, 7-8; Yamasaki and Rollard 2022: 49, fig. 2B, E.

Material examined.

1♂ (IZCAS-Ar 44424) and 1♀ (IZCAS-Ar 44425), China, Yunnan, Xishuangbanna, Mengla County, Menglun Town , Xishuangbanna Botanical Garden , 21°55′16.6′′N, 101°16′35.4′′E, 564 m, hand catch in leaf litter, 7 April 2015, Z.G. Chen leg.

Diagnosis.

The new species resembles P. borneensis (Yamasaki, 2017) (cf. Figs 9 - 11 and Yamasaki et al. 2017: 26, figs 9-28) as the males have a similar sperm duct (Fig. 9A-C ). Males can be distinguished by the embolus slightly curved apically in ventral view (Fig. 9B, E ; vs. embolus strongly curved apically in ventral view); females by the copulatory ducts long and curved (Fig. 10B ; vs. copulatory ducts shorter and almost straight), by the spermathecae II comma-shaped (Fig. 10B ; vs. spermathecae II large and sac-like), and by the spermathecae II with accessory lobes (Fig. 10B ; vs. spermathecae II without accessory lobes).

Description.

Male (Fig. 11A-E ). Total body length 6.79: carapace 3.94 long, 1.48 wide; abdomen 2.85 long, 1.96 wide. Carapace black, covered with granular protuberances, with two distinct regions, cephalic region ladder-shaped, distinguished from thoracic region by deep constriction, thoracic region long, fusiform, lateral margins weakly undulated, terminating with small raised dome; thoracic groove absent. Diameters of eyes: AME 0.13, ALE 0.08, PME 0.10, PLE 0.09. Eye interdistances: AME-AME 0.13, AME-ALE 0.05, PME-PME 0.23, PME-PLE 0.30, AME-PME 0.15, ALE-PLE 0.29. CRW/carapace width = 0.74. MOA 0.36 long, front width 0.41, back width 0.43. Clypeus height almost 1.5 × diameter of AME. Chelicerae same color as carapace, covered with long dark setae along anterior surface; with two promarginal teeth, two retromarginal teeth. Endites brown to black, longer than wide, subapically with membranous area, apical margin with long setae. Labium black, 0.45 long, 0.35 wide. Sternum reddish brown to black, elongate, granulose, covered with white feathery setae, anteriorly extending beyond coxae I, tapering posteriorly, extending between coxae IV, contiguous with precoxal and intercoxal sclerites. Sternum 1.94 long, 0.81 wide. Legs black, but white on coxae I and II, with black bands. Measurements of legs: I 8.52 (2.35, 0.51, 2.38, 1.97, 1.31), II 7.60 (2.24, 0.57, 2.07, 1.65, 1.07), III 6.60 (2.02, 0.63, 1.68, 1.60, 0.67), IV 10.22 (3.29, 0.68, 2.58, 2.61, 1.06). Leg spination: metatarsi I with 1 ventral spine, II-III with two pairs of ventral spines, IV with 1 pair of ventral spines. Abdomen ovoid, reddish brown to black, covered with granular protuberances; venter anteriorly with black epigastric sclerite, reddish brown rectangular ventral sclerite, posteriorly with brown spiracle. Spinnerets brown in anterior part, white in posterior part.

Palp (Fig. 9A-C ). Tibia with triangular prolateral tibial tubercle. Cymbium tip conical, with deep furrow ventrally. Tegulum pyriform, 4/5 length of cymbium, with distinct, sinuous sperm duct. Subtegulum exposed retrolaterally. Embolus short, sclerotized, twisted, apically hook-shaped.

Female (Figs 10A, B , 11F-J ). See Yamasaki et al. (2017: figs 1-5, 7-8) and Yamasaki and Rollard (2022: fig. 2B, E) for complete description.

Distribution.

Myanmar (type locality); China (Yunnan; Fig. 14 ).

Figures

Figure 9. Peng birmanicus comb. nov., male A-C palp, D-F embolus A prolateral view B ventral view C retrolateral view D prolateral view E ventral view F retrolateral view. Abbreviations: E = embolus, SD = sperm duct, ST = subtegulum. Scale bars: 0.20 mm (A-C); 0.05 mm (D-F).

Figure 10. Peng birmanicus comb. nov., female (A, B) A epigyne, ventral view B vulva, dorsal view. Abbreviations: AL = accessory lobe, CD = copulatory duct, CO = copulatory opening, FD = fertilization duct, S I = spermathecae I, S II = spermathecae II. Scale bars: 0.10 mm.

Figure 11. Peng birmanicus comb. nov., male (A-E) and female (F-J) A habitus, dorsal view B habitus, ventral view C habitus, lateral view D cephalothorax, frontal view E cephalic region, dorsal view F habitus, dorsal view G habitus, ventral view H habitus, lateral view I cephalothorax, frontal view J cephalic region, dorsal view. Scale bars: 1.00 mm (A-C, F-H); 0.50 mm (D, E, I, J).

Figure 14. New distribution records of corinnid species from China and Vietnam 1 Allomedmassa tamdao sp. nov. 2 Echinax baisha sp. nov. 3 Fengzhen mengla sp. nov. 4 Medmassa lingshui sp. nov. 5 Peng birmanicus comb. nov. 6 Spinirta shaoguan sp. nov.