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.