Chamalycaeus sylheticus (Godwin-Austen, 1914)

Fig. 13F–I

Alycaeus sylheticus Godwin-Austen, 1914: 382, pl. 154 figs 4, 4a.

Alycaeus sylheticus – Gude 1921: 220.

Dicharax sylheticus – Páll-Gergely et al. 2020: 74; 2021: 23, fig. 16.

Type material examined

BANGLADESH • holotype (single shell mentioned in the original description: Fig. 13F–I); S Sylhet Hills; W. Channel leg.; NHMUK 1903.7.1.55 .

Type locality

“South Sylhet Hills”.

Differential diagnosis

The most similar species is C. solidus in terms of shell shape and sculpture, but that species is slightly larger, has a more elevated spire, and a more bulging R3 swelling.

Remarks

This species was included in the genus Dicharax in spite of the presence of spiral striation, because the R2 ribs were typical of that genus (Páll-Gergely et al. 2020). However, the critical revision of Himalayan species of Chamalycaeus and Dicharax revealed that C. sylheticus belongs to this species group of Chamalycaeus due to other conchological traits (colourless shells, strong and widely-spaced R1 ribs, upper apertural notch).