Spinirta shaoguan Lu & Li, 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

Spinirta shaoguan Lu & Li sp. nov.

Figs 12 , 13

Type material.

Holotype: 1♂ (IZCAS-Ar 44426), China, Guangdong, Shaoguan, Nanling Nature Reserve, 24.9287°N, 113.0102°E, hand catch in leaf litter, 16-21 July 2008, G. Tang leg.

Etymology.

The specific name refers to the type locality and is a noun in apposition.

Diagnosis.

The new species resembles S. aurita Jin & Zhang, 2020 (cf. Figs 12 , 13 and Jin and Zhang 2020: 317, figs 3D, 14A-I, 15A-D) as the males have similar triangular prolateral tibial tubercle (Fig. 12A ) and a retrolateral tibial apophysis with the outer edge ear-shaped (Fig. 12B, C ). Males can be distinguished by the tibia with a large, triangular ventral apophysis (Fig. 12A-C ; vs. tibia with inconspicuous ventral protrusion), by the ventral surface of retrolateral tibial apophysis with long coniform spines (Fig. 12B, C ; vs. ventral surface of retrolateral tibial apophysis with short coniform spines), and by the embolus digitiform, curved, apically sclerotized, with file-like grooves on the surface, and with two coniform apophyses distally and a small sharp apophysis centrally (Fig. 12A-C ; vs. embolus long, with long and sharp embolar apophysis, file-like grooves almost invisible on embolar apophysis surface). Female unknown.

Description.

Male (holotype, Fig. 13A, B ). Total body length 9.64: carapace 5.05 long, 3.86 wide; abdomen 4.59 long, 2.82 wide. Carapace dark brown to black, convex, with rough surface; highest before fovea; thoracic region ovoid, cephalic region with parallel sides; widest at coxae II, gradually narrowing backwards, slightly concave at posterior margin before pedicel; radial and cervical grooves indistinct; fovea longitudinal, short. Diameters of eyes: AME 0.19, ALE 0.22, PME 0.20, PLE 0.23. Eye interdistances: AME-AME 0.30, AME-ALE 0.21, PME-PME 0.33, PME-PLE 0.38, AME-PME 0.34, ALE-PLE 0.17. CRW/carapace width = 0.61. MOA 0.70 long, front width 0.62, back width 0.73. Clypeus height narrower than diameter of AME. Chilum present, single, triangular, sclerotized, and brown. Chelicerae same color as carapace; with three promarginal teeth, five retromarginal teeth. Endites brown, longer than wide, subapically with membranous area, apical margin with long, curved setae. Labium dark brown, longer than wide. Labium 0.82 long, 0.73 wide. Sternum dark brown marginally and light brown centrally, shield-shaped, longer than wide, precoxal triangles present. Sternum 2.26 long, 1.85 wide. Legs dark brown to yellowish, coxae I brown, coxae II-IV yellowish. Measurements of legs: I 14.76 (4.11, 1.83, 3.58, 3.39, 1.85), II 14.09 (3.98, 1.72, 3.32, 3.29, 1.78), III 11.92 (3.28, 1.56, 2.69, 2.82, 1.57), IV 15.29 (3.94, 1.69, 3.56, 4.45, 1.65). Leg spination: tibiae I-II with four pairs of ventral spines, III-IV with two pairs of ventral spines; metatarsi I-IV with two pairs of ventral spines. Abdomen ovoid, dark brown, with longitudinal strip and yellowish patch anteriorly and medially, and white patch posteriorly; venter dark brown, with two yellowish arched patches. Spinnerets yellowish, with brown marks.

Palp (Fig. 12A-C ). Tibia with triangular prolateral tibial tubercle and large, triangular ventral tibial apophysis; retrolateral tibial apophysis outer edge ear-shaped, ventral surface with dense thick long coniform spines. Cymbium tip conical, apically with stout setae, and with deep furrow ventrally. Tegulum elongate oval, 2/3 length of cymbium, with U-shaped sperm duct, sinuous at distal part. Subtegulum exposed prolaterally. Embolus digitiform, curved, apically sclerotized, with file-like grooves on surface, and with two coniform apophyses distally and small sharp apophysis centrally.

Distribution.

China (Guangdong, type locality; Fig. 14 ).

Figures

Figure 12. Spinirta shaoguan sp. nov., holotype male A-C palp A prolateral view B ventral view C retrolateral view. Abbreviations: E = embolus, PTT = prolateral tibial tubercle, RTA = retrolateral tibial apophysis, SD = sperm duct, ST = subtegulum, VTA = ventral tibial apophysis. Scale bar: 1.00 mm.

Figure 13. Spinirta shaoguan sp. nov., holotype male A, B habitus A dorsal view B ventral view. Scale bar: 1.00 mm.

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.