Allomicythus youzi Yao & Liu, 2025

Jiang, Zimin, Ning, Xiaoqi, Yao, Yanbin, Wang, Zhongjing & Liu, Keke, 2025, A new species of the genus Allomicythus, with a first record and the description of the male of Echemus viveki Gajbe, 1989 (Araneae, Gnaphosidae) from China, Zootaxa 5646 (1), pp. 115-123 : 116-118

Allomicythus youzi Yao & Liu , sp. nov.

Vernacular name: DZŦ异*ñe

Figure 1

Type material. Holotype ♂ (20240403, Gna-140), CHINA: Fujian Province, Zhangzhou City, Nanjing County, Huboliao Nature Reserve , Huboliao area , 24°31'2.88"N, 117°14'53.47"E, 3.IV.2024, Yanbin Yao, Jiaxian Gong, Rui Zhao & Mingxuan Wu leg.

Etymology. The specific name refers to the Chinese name for grapefruit from the type locality, youzi, which is widely planted all over the city; noun in apposition.

Diagnosis. The only known male of this new species is similar to that of Allomicythus suochao Lin & Li, 2023 (see Lin and Li 2023: 144, figs 2A−C, 4B) in having the abdomen with a large and broad dorsal scutum, the long retrolateral tibial apophysis reaching ca 1/3 of the cymbium, and the S-shaped sperm duct on male palp in retrolateral view, but can be easily distinguished from it by the screw-like embolus (vs slightly coiled in A. suochao ) ( Fig. 1A , C−E).

Description. Male (holotype) ( Fig. 1A, B ). Total length 3.72 mm. Carapace 1.64 long, 1.32 wide. Eye sizes and interdistances: AME 0.12, ALE 0.11, PME 0.11, PLE 0.11, AME−AME 0.02, AME−ALE 0.02, PME−PME 0.10, PME−PLE 0.03, AME−PME 0.11, AME−PLE 0.03, ALE−ALE 0.27, PLE−PLE 0.28, ALE−PLE 0.04. MOA 0.33 long, front width 0.27, back width 0.29. Chelicerae with three promarginal and one retromarginal teeth. Endites longer than wide, laterally with long setae. Labium ovoid, wider than long. Sternum oval, anteriorly flat, posterior end blunt. Leg measurements: I 3.58 (1.10, 0.61, 0.79, 0.64, 0.44); II 3.47 (1.07, 0.59, 0.75, 0.64, 0.42); III 3.26 (0.96, 0.50, 0.63, 0.70, 0.47); IV 4.31 (1.21, 0.62, 0.97, 1.03, 0.48). Leg spination: I Fe: d2, r1; Ti: v4; Mt: v2; II Fe: d3, r1; Ti: v5; Mt: v2; III Fe: d4, p2; Ti: p4, r2, v5; Mt: d4, p4, r3, v3; IV Fe: d5; Pa: p1; Ti: p2, r2, v6; Mt: d4, p4, r4, v2. Abdomen 2.08 long, 1.36 wide, oval with a distinct dorsal scutum covering 1/2 the length of the abdomen.

Coloration ( Fig. 1A, B ). Carapace yellow, posteriorly with brown radial stripes. Chelicerae and endites yellow. Labium yellow to brown. Sternum yellowish to brown. Legs yellow to pale brown, femora yellow, patellae, tibiae, and metatarsi palp brown. Abdomen white to dark brown.

Palp ( Fig. 1 C−E). Retrolateral tibial apophysis long, slightly longer than tibia, sub-medially slightly curved, terminally sharp and narrowed in ventral view, with a thick horn-like tip in retrolateral view. Sperm duct with two Sshaped turns in ventral view.Tegular surface mostly membranous, forming an apical retrolateral fold which surrounds the embolar base. Embolus conical, screw-like, rising from the tegular apical fold with a vertical membranous base and eight ridges seen in prolateral view.

Female. Unknown.

Ecology. The specimen was collected under the bark of Fagaceae plants in a broad-leaved forest.

Distribution. Known only from the type locality in Fujian Province, China ( Fig. 6 ).

Figures

FIGURE 1. Allomicythus youzi sp. nov., male holotype. A. Habitus, black arrow shows the dorsal scutum, dorsal view; B. Same, ventral view; C. Palp, prolateral view; D. Same, ventro-retrolateral view; E. Same, retrolateral view. Abbreviations: EB = embolar base, Em—embolus, RF = retrolateral fold, RTA—retrolateral tibial apophysis, SD—sperm duct, Scale bars: 0.5 mm (A, B); 0.1 mm (C−E).

FIGURE 6. Distributional records of Allomicythus youzi sp. nov. (black circle) and Echemus viveki Gajbe, 1989 (red circle) from China.