Oia ceratinum, 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 : 201-207

Oia ceratinum sp. nov. (ssḦḄǞƦ)

Figures 239–243

Types. Holotype ♂, CHINA, Yunnan, Gongshan County, Dulongjiang Township, East bench of Dulongjiang at Baili Village , 28.00985°N, 98.32352°E, alt. 1670m, 3 November 2004, D. H. Kavanaugh leg. ( DHK –2004– 070) . Paratypes: 6♂ 4♀, same data as holotype ( DHK – 2004–070) .

Etymology. This epithet derives from the Latin adjective “ ceratinus ”, meaning “horned” and refers to the horn-like prolateral tibial apophysis in the male palp.

Diagnosis. The new species resembles Oia sororia Wunderlich, 1973 ( Figs 239A–D , 240A–D , 241A–C ; Wunderlich, 1973, figs 36, 37), but can be distinguished by dorsal tibial apophysis relatively narrower in O. ceratinum sp. nov. ( Figs 239A, B , 240A ), whereas broader in O. sororia sp. nov. ( Wunderlich, 1973, figs 36, 37). Distal suprategular apophysis leaf-shaped in retrolateral view in O. ceratinum sp. nov. ( Figs 239B , 240B ), whereas tongue-shaped in O. sororia sp. nov. ( Wunderlich, 1973, figs 36, 37). Copulatory ducts spirally coiled before entering the spermathecae in O. ceratinum sp. nov. ( Fig. 241A–C ), whereas directly enter the spermathecae in O. sororia sp. nov. ( Wunderlich, 1973, fig. 42).

Description. Male (holotype, Fig. 242A, B): Total length: 1.46. Carapace 0.63 long, 0.49 wide; cephalic region slightly elevated, ocular quad triangular, yellow; fovea, cervical and radial grooves distinct. Clypeus 0.16 high. Sternum longer than wide, brown,, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae with five promarginal and five retromarginal teeth. Eyes: AER recurved, PER slightly recurved, wider than AER. Eye sizes and interdistances:AME 0.02, ALE 0.04, PME 0.03, PLE 0.04, AME–AME 0.01, PME–PME 0.01, AME– ALE, 0.01, PME–PLE 0.01, AME–PME 0.03, ALE–ALE 0.12, PLE–PLE 0.15, ALE–PLE contiguous. Length of legs: I 1.62 (0.52, 0.55, 0.29, 0.26), II 1.50 (0.47, 0.51, 0.28, 0.24), III 1.35 (0.41, 0.43, 0.27, 0.24), IV 1.67 (0.52, 0.55, 0.35, 0.25). Leg formula IV-I-II-III. Tm I 0.18 and Tm IV 0.14. Tibial spine formula: 1-1-1-1. Abdomen 0.79 long, 0.50 wide, oval, yellowish, no distinct pattern; ventral side yellowish, no distinct pattern.

Palp ( Figs 239A–D , 240A–D ): Femur almost as long as patella; patella broader distally, almost equal to the collective length of tibia and cymbium; tibia with one retrolateral and one dorsal trichobothria, retrolateral margin with three bristles and dorsally with a thick prominent bristle with curved pointed tip, dorsal tibial apophysis tongue-shaped, pointing towards the prolateral side of the tibia and the prolateral tibial apophysis with a sclerotized horned-shaped tip; paracymbium sclerotized, simple, hook-shaped; distal suprategular apophysis proximally broad with blunt tip; tegulum with a transparent protegulum; terminal apophysis sclerotized, short with pointed end; embolic membarane broad distally, covers the embolus in retrolateral view; embolus sclerotized, short, curved with blunt end.

Female (one of paratypess, Fig. 242C, D): Total length: 1.46. Carapace 0.63 long, 0.49 wide; cephalic region slightly elevated, yellow; fovea, cervical and radial grooves distinct. Clypeus 0.16 high. Sternum longer than wide, yellowish green,, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae with five promarginal and five retromarginal teeth. Eyes: AER recurved, PER slightly recurved, wider than AER. Eye sizes and interdistances: AME 0.03, ALE 0.04, PME 0.04, PLE 0.04, AME–AME 0.01, PME–PME 0.04, AME–ALE, 0.01, PME–PLE 0.02, AME–PME 0.04, ALE–ALE 0.15, PLE–PLE 0.18, ALE–PLE contiguous. Length of legs: I 1.55 (0.51, 0.54, 0.27, 0.23), II 1.44 (0.45, 0.49, 0.26, 0.24), III 1.24 (0.38, 0.37, 0.26, 0.23), IV 1.62 (0.52, 0.58, 0.28, 0.24). Leg formula IV-I-II-III. Tm I 0.19 and Tm IV 0.15. Tibial spine formula: 1-1-1-1. Abdomen 0.83 long, 0.55 wide, oval, yellowish.

Epigyne ( Fig. 241A–C ): Copulatory openings present mesally on the dorsal plate, copulatory ducts short; spermathecae globular; fertilization ducts short, extending mesally.

Distribution. Known only from the type locality ( Fig. 243 ).

Genus Paikiniana Eskov, 1992 (ăęƦø)

Figures

FIGURE 239. Oia ceratinum sp. nov., male (holotype, A, B, one of paratype, C, D). A Palp, prolateral view B Palp, retrolateral view C Embolic division, dorsal view D Embolic division, ventral view.

FIGURE 240. Oia ceratinum sp. nov., male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view.

FIGURE 241. Oia ceratinum sp. nov., female (one of paratypes). A, B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 243. Distribution of Oia ceratinum sp. nov..