Sinogone, 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 : 105

Sinogone gen. n. (ḲȐĦM)

Type species: Sinogone caesuma sp. n.

Etymology. The genus name is a combination of “ Sino ” (refers to Chinese) with the second part taken from subfamily “ Erigoninae ”. Gender is feminine.

Diagnosis. Sinogone gen. n. cannot be placed in any of the genus groups proposed by Millidge (1977). Male of Sinogone gen. n. can be differentiated from all other Erigoninae genera by the following unique combination of characters: 1) cephalic lobe absent rather than cephalic region elevated; cephalic pits conspicuous located behind the PLEs ( Fig. 23A, B ); 2) dorsal tibial apophysis with bifurcated apex, pointing retrolaterally in ventral view; 3) distal suprategular apophysis unmodified; 4) radix give rise to long curved embolus and round to oval anterior radical process ( Fig. 21A–D ); 5) paracymbium U-shaped, distal arm with hook-shaped tip ( Fig. 21B ). Female can be identified with unique structure as pair of lateral arms originate from the anterior margin of ventral plate of epigyne and extending posteriorly above the epigastric furrow, these lateral arms do not have any connection with the copulatory ducts or copulatory opening; ventral plate extending posteriorly above the epigastric furrow with copulatory opening as in genus Dicristatus Irfan, Wang & Zhang, 2023 ( Fig. 22A–F ; Fig. 9A–F ).

Composition. Since Sinogone caesuma sp. n. doesn't fit into any known Erigoninae genera, we propose Sinogone gen. n. to accommodate the new species.

Figures

FIGURE 9. Dicristatus modaoxiensis sp. nov., female (one of paratypes): A, C, D Epigyne, ventral view, B Epigyne, lateral view, E Vulva, dorsal view F Vulva, anterior view.

FIGURE 21. Sinogone caesuma sp. nov., male holotype, left palp. A prolateral view B retrolateral view C dorsal view D ventral view.

FIGURE 22. Sinogone caesuma sp. nov., female (one of paratypes). A, C Epigyne, ventral view, B Epigyne, lateral view, D Vulva, dorsal view, E Epigyne, posterior view F Vulva, posterior view.

FIGURE 23. Sinogone caesuma sp. nov., male holotype (A, B) and female (one of paratype, C). A, C habitus, dorsal view B habitus, dorso-lateral view.