Medmassa lingshui 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

Medmassa lingshui Lu & Li sp. nov.

Figs 7 , 8

Type material.

Holotype: 1♂ (IZCAS-Ar 44423), China, Hainan, Lingshui, Diaoluoshan Mountain, 18°40.440′N, 109°52.600′E, 505 m, hand catch in leaf litter, 10 August 2010, G. Zheng leg.

Etymology.

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

Diagnosis.

The new species resembles M. torta Jin, Zhang & Zhang, 2019 (cf. Figs 7 , 8 and Jin et al. 2019: 469, figs 8A-H, 9A-C) as the males have a similar sclerotized, triangular prolateral tibial tubercle (Fig. 7A ) and small prolatero-proximal cymbial outgrowth (Fig. 7B ). Males can be distinguished by the triangular embolus, that is slightly curved, and integrated with the tegulum (Fig. 7B ; vs. spine-shaped embolus, almost straight), by the retrolateral tibial apophysis entirely sclerotized apically (Fig. 7B, C ; vs. retrolateral tibial apophysis twisted and weakly sclerotized), and by the ventral branch of the retrolateral tibial apophysis pointed and curved, and the dorsal branch of the retrolateral tibial apophysis blunt, pointing dorsally (Fig. 7B, C ; vs. ventral and dorsal branches of retrolateral tibial apophysis almost straight, pointing ventrally). Female unknown.

Description.

Male (holotype; Fig. 8A, B ). Total body length 6.30: carapace 2.97 long, 2.69 wide; abdomen 3.33 long, 1.91 wide. Carapace dark brown, smooth, almost round, and flat, strong arched caput, sloping gradually back from fovea; posterior margin truncated; fovea longitudinal, black. Diameters of eyes: AME 0.25, ALE 0.14, PME 0.16, PLE 0.17. Eye interdistances: AME-AME 0.10, AME-ALE 0.04, PME-PME 0.20, PME-PLE 0.12, AME-PME 0.15, ALE-PLE 0.11. CRW/carapace width = 0.52. MOA 0.54 long, front width 0.56, back width 0.51. Clypeus height 2 × AME diameter. Chilum present, single, and triangular. Chelicerae same color as carapace, without concave depression at distal end dorsally; with three promarginal teeth, four retromarginal teeth. Endites brown, longer than wide, subapically with membranous area, apical margin with long, curved setae. Labium dark brown, as wide as long. Labium 0.49 long, 0.55 wide. Sternum yellowish, with brown margin, shield-shaped, as wide as long. Sternum 1.49 long, 1.55 wide. Legs dark brown and strong, but yellowish on coxae and trochanters. Measurements of legs: I 10.32 (2.92, 1.16, 2.79, 2.21, 1.24), II 9.66 (2.73, 1.11, 2.35, 2.19, 1.28), III 10.47 (2.61, 1.08, 2.24, 2.87, 1.67), IV 12.12 (2.98, 1.14, 2.65, 3.44, 1.91). Leg spination: tibiae I with nine pairs of ventral spines, II with six pairs of ventral spines, III with two pairs of ventral spines, IV with three pairs of ventral spines; metatarsi I-IV with three pairs of ventral spines. Abdomen ovoid, dark grey, with yellowish dorsal scutum centrally; venter yellowish, posteriorly grey; laterally dark grey, with pale stripes. Spinnerets yellowish.

Palp (Fig. 7A-C ). Tibia with sclerotized, triangular prolateral tibial tubercle; retrolateral tibial apophysis distally bifurcated, ventral branch curved and pointed, dorsal branch sclerotized and blunt. Cymbium elongate-oval, dorsally with chemosensory patch, prolaterally with small outgrowth, and with deep furrow ventrally, extending to tip. Tegulum oval, 3/4 length of cymbium, with U-shaped sperm duct. Subtegulum exposed prolaterally. Embolus triangular and short, integrated with tegulum.

Distribution.

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

Figures

Figure 7. Medmassa lingshui 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. Scale bar: 0.50 mm.

Figure 8. Medmassa lingshui 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.