Dicharax plectocheilus (Benson, 1859)

Fig. 37A–D

Alycaeus plectocheilus Benson, 1859: 180 .

Alycaeus plectocheilus – Sowerby 1877: pl. 2, species 14. — Godwin-Austen 1914: 342–343, pl. 134 figs 4, 4a–c.

Alycaeus (Dicharax) plectochilus [sic] – Kobelt 1902: 375. — Gude 1921: 264–265.

Alycaeus plectocheilus, large var. – Godwin-Austen 1914: 342–343, pl. 133 figs 3, 3a–c.

Chamalycaeus (Dicharax) plectochilus – Ramakrishna et al. 2010: 65.

Dicharax plectocheilus – Páll-Gergely et al. 2017: 54. — Preece et al. 2022: 80, fig. 38e–f. — Gittenberger et al. 2024: 214, figs 39–40, 43.

Dicharax (?) plectocheilus – Páll-Gergely et al. 2020: 101.

Type material examined

INDIA • 2 syntypes (Fig. 37A–D); Darjiling, Rungun Valley; Blanford coll.; NHMUK 1906.4.4.184 .

Type locality

“in valle Rungun”.

Differential diagnosis

There are two other species in this species group with smooth R2 surface: D. subdigitatus and D. tangmaiensis . The former has a larger shell, has a larger distance between the R3 swelling and the peristome, and less protruding peristomal projections; the latter is much larger than D. plectocheilus and has a less elevated R3 swelling. See also under D. digitatus .