Ceratinella acutalum, Irfan & Zhang & Peng, 2022

Irfan, Muhammad, Zhang, Zhi-Sheng & Peng, Xian-Jin, 2022, Survey of Linyphiidae (Arachnida: Araneae) spiders from Yunnan, China, Megataxa 8 (1), pp. 1-292 : 57-58

Ceratinella acutalum sp. nov. (ḰssẮƦ)

Figures 58–60

Types. Holotype ♂, CHINA, Yunnan, Yongping County, near rice paddies, 25.36863°N, 98.54363°E, alt. 1620m, 9 October 1998, Charles Griswold, D. H. Kavanaugh and Chun-lin Long leg. (98–YP).

Etymology. This epithet derives from the Latin adjective “ acutalis ”, meaning “pointed” and refers to the pointed tip of the retrolateral tibial apophysis in the male palp.

Diagnosis. This new species resembles Ceratinella brevis ( Wider, 1834) in having the male cephalic lobe absent, but can be distinguished by the distal end of retrolateral tibial apophysis pointing towards the cymbium in C. acutalum sp. nov. ( Figs 58B, D , 59C ), whereas the distal part touches the proximal part of paracymbium in C. brevis (Cosar, 2021, figs 12–14); distally inner margin of embolus distally with a broad lobe in C. acutalum sp. nov. ( Fig. 58B ), whereas absent in C. brevis (Cosar, 2021, figs 12–14).

Description. Male (holotype, Fig. 59A, B ): Total length: 1.58. Carapace 0.71 long, 0.58 wide; cephalic region slightly elevated, brown; fovea, cervical and radial grooves distinct. Clypeus 0.14 high. Sternum wider than long, brown, sparsely covered with microsetae; labium wider than long; maxillae long, distal end broad with scopulae. Chelicerae with four promarginal and six retromarginal teeth. Eye region narrow, AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.04, PLE 0.05, AME–AME 0.03, PME–PME 0.04, AME–ALE, 0.04, PME–PLE 0.06, AME–PME 0.04, ALE–ALE 0.27, PLE–PLE 0.31, ALE–PLE contiguous. Length of legs: I 2.05 (0.58, 0.71, 0.41, 0.35), II 1.81 (0.55, 0.60, 0.39, 0.27), III 1.52 (0.47, 0.47, 0.32, 0.26), IV 1.75 (0.59, 0.52, 0.36, 0.28). Leg formula I-II-IV-III. TmI and TmIV present. Tibial spine formula: 1-1-1-1. Abdomen 0.71 long, 0.58 wide, oval, gray, covered with fine hairs.

Palp ( Figs 58A–D , 59C ): Tibia dorsally with broad, long apophysis, distal end slightly curved, sclerotized with pointed end; paracymbium U-shaped, distal tip slightly curved; subtegulum and tegulum highly sclerotized, protegulum vestigial; distal suprategular apophysis broad with blunt end, covered by the embolus and the tegulum. Embolic division: embolic membrane hidden on unexpended palp; tailpiece relatively long, sclerotized, slightly curved with blunt end, almost touches the basal margin of cymbium in ventral view. Embolus long, highly area, 27.16636°N, 98.77667°E, alt. 2563m, 4 May 2004, Charles Griswold and D. H. Kavanaugh leg. ( CGY28 ) .

Distribution. China.

Genus Collinsia O. Pickard-Cambridge, 1913 (ũH Ʀø)

Figures

FIGURE 58. Ceratinella acutalum sp. nov., male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view.

FIGURE 59. Ceratinella acutalum sp. nov., male holotype. A Habitus, dorsal view B Habitus, ventral view C Tibia, dorsal view.

FIGURE 60. Distribution of Ceratinella acutalum sp. nov..