Ryojius latus, Muhammad & Wang & Zhang, 2023

Muhammad, Irfan, Wang, Lu-Yu & Zhang, Zhi-Sheng, 2023, One new genus and nine new species of Linyphiidae spiders from Yintiaoling Nature Reserve, Chongqing of China, Zootaxa 5257 (1), pp. 82-114 : 100-101

Ryojius latus sp. n. (ṀRĀĦ)

Figures 15 , 16

Type material. Holotype male: CHINA: Chongqing, Wuxi County, YNR, Guanshan Forest farm, Shizhuzi , 31°32′15.29″N, 109°41′49.82″E, elev. 2147 m, 30.IX.2020, Z.S. Zhang et al. leg. (SWUC-T-LIN-30-01).

Etymology. This epithet derives from the Latin adjective “ latus ” meaning “broad” and referring to the anterior terminal apophysis broad in male palp.

Diagnosis. Ryojius latus sp. n. resembles R. flosculus sp. n. in having the similar paracymbium ( Fig. 15A–D ; Fig. 14A–D ), but can be distinguished by the distal tip of long arm of lamella characteristca bifurcated in R. latus sp. n. ( Fig. 15A, B, D ), vs., flower-shaped in R. flosculus sp. n. ( Fig. 14B, D ).

Description. Male ( Fig. 16B ): Total length: 2.13. Carapace 0.99 long, 0.83 wide, brown; fovea, cervical and radial grooves distinct. Clypeus 0.13 high. Chelicerae with 6 promarginal and 5 retromarginal teeth. AER recurved, PER straight, slightly wider. Eye sizes and interdistances: AME 0.04, ALE 0.08, PME 0.07, PLE 0.07, AME–AME 0.02, PME–PME 0.05, AME–ALE, 0.04, PME–PLE 0.05, AME–PME 0.03, ALE–ALE 0.31, PLE–PLE 0.33, ALE–PLE contiguous. Length of legs: I 2.76 (0.79, 0.95, 0.59, 0.43), II 2.52 (0.73, 0.86, 0.54, 0.39), III 2.02 (0.61, 0.64, 0.44, 0.33), IV 2.65 (0.77, 0.91, 0.59, 0.38). Tm I 0.31 and Tm IV 0.19. Tibial spine formula: 2-2-2-2. Abdomen 1.04 long, 0.75 wide, oval, grey, mid dorsally with black patch; ventral side grey.

Palp ( Fig. 15A–D ): Patella as long as tibia; tibia with one retrolateral and one dorsal trichobothria and two apophyses; retrolateral tibial apophysis strongly sclerotized, wider than long, pointing laterally in dorsal view, dorsal tibial apophysis wither than long, with round tip. Cymbium with shallow depression at base retrolaterally. Paracymbium strongly sclerotized, distal arm tip triangular. Distal suprategular apophysis small, most of proximal part covered by the tegulum, distal end sclerotized, with narrow hook-shaped tip. Radix C-shaped. Lamella characteristica with 2 branches; posterior horn-shaped and anterior one long, extending towards the cymbial apex, tip bifurcated. Terminal apophysis longer than wide, tip serrated. Embolus conspicuously large, posteriorly curved about half circle, apex strongly sclerotized, finger-shaped with blunt tip; thumb short, covered by the lamella characteristica; embolus proper blunt.

Female. Unknown

Distribution. Known only from the type locality.

Figures

FIGURE 14. Ryojius flosculus sp. nov., male holotype, left palp. A prolateral view B retrolateral view C dorsal view D ventral view.

FIGURE 15. Ryojius latus sp. nov., male holotype, left palp. A prolateral view B retrolateral view C dorsal view D ventral view.

FIGURE 16. Ryojius flosculus sp. nov., male holotype (A), Ryojius latus sp. nov., male holotype (B). A, B habitus, dorsal view.