Allomedmassa tamdao 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

publication ID	https://dx.doi.org/10.3897/zookeys.1165.102672
publication LSID	lsid:zoobank.org:pub:00A3E9D0-3E46-4F69-B5D1-1B16DAC47910
persistent identifier	https://treatment.plazi.org/id/B2D688F7-0B2D-4EAA-942E-F457CFE8F483
taxon LSID	lsid:zoobank.org:act:B2D688F7-0B2D-4EAA-942E-F457CFE8F483
treatment provided by	ZooKeys by Pensoft
scientific name	Allomedmassa tamdao Lu & Li
status	sp. nov.

Treatment

Allomedmassa tamdao Lu & Li sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2

Type material.

Holotype: 1♂ (IZCAS-Ar 44416), Vietnam, Vinh Phuc, Tam Dao National Park, 21°29.428′N, 105°37.008′E, 1077 m, Sieving in leaf litter, 21 August 2007, D.S. Pham leg.

Etymology.

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

Diagnosis.

The new species resembles A. bifurca Jin, Zhang & Zhang, 2019 (cf. Figs 1 View Figure 1 , 2 View Figure 2 and Jin et al. 2019: 462, figs 3A-G, 4A-C) in that the males have a similar triangular prolateral tibial tubercle (Fig. 1A View Figure 1 ). Males can be distinguished by the slightly curved and spine-shaped embolus, which is more slender (Fig. 1B View Figure 1 ; vs. S-shaped embolus, strong, with fine dorsal branch near tip, originating from the base of the embolus and shorter than the embolus), by the tegulum being slightly convex on the retrolateral side (Fig. 1C View Figure 1 ; vs. tegulum strongly convex on the retrolateral side), and by the retrolateral tibial apophysis strong, with a wide base and a sharp, strongly curved tip (Fig. 1A-C View Figure 1 ; vs. retrolateral tibial apophysis relatively slender, spine-shaped and slightly curved). Female unknown.

Description.

Male (holotype; Fig. 2A, B View Figure 2 ). Total body length 9.72: carapace 4.83 long, 3.75 wide; abdomen 4.89 long, 3.23 wide. Carapace black, obviously convex, with rough surface, highest before fovea; thoracic region almost round and cephalic region long and parallel-sided; widest at coxae II, gradually narrowing backwards, strongly concave at posterior margin before pedicel; radial and cervical grooves indistinct; fovea longitudinal, short. Diameters of eyes: AME 0.26, ALE 0.18, PME 0.22, PLE 0.22. Eye interdistances: AME-AME 0.18, AME-ALE 0.17, PME-PME 0.36, PME-PLE 0.36, AME-PME 0.26, ALE-PLE 0.16. CRW/carapace width = 0.70. MOA 0.71 long, front width 0.67, back width 0.74. Clypeus height narrower than diameter of AME. Chilum present, single, triangular, sclerotized, and brown. Chelicerae same color as carapace, concave at distal end dorsally; with three promarginal teeth, five retromarginal teeth. Endites and labium dark brown, longer than wide; endites subapically with membranous area, apical margin with long, curved setae. Labium 0.86 long, 0.68 wide. Sternum brown, shield-shaped, precoxal triangles and intercoxal sclerites present. Sternum 2.24 long, 1.83 wide. Legs dark brown to brown. Measurements of legs: I 15.25 (4.26, 1.82, 3.74, 3.44, 1.99), II 14.41 (4.12, 1.71, 3.40, 3.31, 1.87), III 11.83 (3.24, 1.53, 2.62, 2.97, 1.47), IV 15.23 (4.09, 1.59, 3.65, 4.25, 1.65). Leg spination: tibiae I-II with four pairs of ventral spines, III-IV with two pairs of ventral spines; metatarsi I and II with two pairs of ventral spines, III and IV with three pairs of ventral spines. Abdomen ovoid, dark grey, with brown dorsal scutum anteriorly, posteriorly with several light grey chevrons; venter anteriorly with brown, rectangular scutum, posteriorly dark grey. Spinnerets grey.

Palp (Fig. 1A-C View Figure 1 ). Tibia with ventral surface flat and slanting, not forming a hump, with triangular prolateral tibial tubercle; retrolateral tibial apophysis well developed, with wide base and sharp end, only curved at end. Cymbium tip conical. Tegulum slightly flattened basally, slightly convex on retrolateral side, 3/5 length of cymbium, with U-shaped sperm duct. Subtegulum exposed prolaterally. Embolus slender, spine-shaped, and slightly curved.

Distribution.

Vietnam (Vinh Phuc, type locality; Fig. 14 View Figure 14 ).