Genus Chuanattus C. Wang, Mi & Li gen. nov.

Type species.

Chuanattus deelemanae sp. nov.

Diagnosis.

Chuanattus gen. nov. resembles that of Yaginumaella Prószyński, 1979 in having a similar habitus and almost identical copulatory organs, especially the presence of a longitudinal, irregular central patch dorsally on the abdomen, a pair of epigynal hoods and similar path of copulatory ducts, but differs in: 1) the lacking of the posterior tegular lobe (Fig. 3 B) vs present in Yaginumaella (Figs 7 B, 9 B, 11 B, 13 B, 15 C); 2) the lacking of a longitudinal, central thoracal stripe (Fig. 4 F, H) vs present except some males in Yaginumaella (Figs 8 C, E, 10 E, F, 12 C, D, 16 C, E); 3) the presence of a dorsal abdominal scutum in male (Fig. 4 F) vs absent in Yaginumaella (Figs 8 C, 10 E, 12 C, 14 E, 16 C). The genus also somewhat resembles that of Ptocasius Simon, 1895 in the general shape of copulatory organs, but can be distinguished by the followings: 1) the embolus is curved approximately a quarter of a circle (Fig. 3 B) vs curved at least half a circle in Ptocasius (Żabka 1985: figs 513, 517, 521, 530; Logunov and Jäger 2015: fig. 52; Cao et al. 2016: fig. 38 C, D; Patoleta et al. 2020: fig. 7 G, H); 2) the lacking of the tegular bump (Fig. 3 B), vs present except modified into a pale area in the type species and its congeners in Ptocasius (Żabka 1985: figs 513, 517, 521; Cao et al. 2016: fig. 38 C, D; Patoleta et al. 2020: fig. 7 G, H); 3) the copulatory ducts are not forming median ridges (Fig. 2 C, E) vs forming obvious prominent median ridges in Ptocasius (Żabka 1985: fig. 526; Logunov and Jäger 2015: fig. 55; Cao et al. 2016: fig. 39 B; Patoleta et al. 2020: figs 8 G, H, 9 G, H); 4) the abdomen has a longitudinal, central irregular path dorsally (Fig. 4 F, H) vs has an anterior, transverse, near arc-shaped stripe and a pair of medio-lateral or posterolateral, oval patches or instead by a complete transverse patch in Ptocasius (Patoleta et al. 2020: figs 7 A, 8 A, 9 A; Logunov 2024: figs 125, 130).

Description.

See description of type species.

Composition.

Currently, it only includes the type species.

Distribution.

China (Sichuan).

Etymology.

The generic name is a combination of chuan, the pinyin of a short Chinese name of Sichuan Province, the type locality of the type species, and attus, meaning jumper. The gender is masculine.

Comments.

Yaginumaella pentamaculata (Hu, 2001), comb. nov. shares a similar epigyne with the type species, especially the form of the atrium and the epigynal hood position, indicating it could be a potential member of this genus, but those are not obviously different from some Yaginumaella . Thus, it has been transferred to Yaginumaella temporarily because it is generally more similar to Y. circula (Yang & Peng, 2023), comb. nov.