Dicharax gemmula ( Benson, 1859 )

Dicharax gemmula ( Benson, 1859) View in CoL

Fig. 67

Alycaeus gemmula Benson, 1859: 179–180 View in CoL .

Alycaeus ( Charax) subhumilis Möllendorff, 1897a: 41 View in CoL . Syn. nov.

Alycaeus gemmula View in CoL – Sowerby 1877: pl. 5, species 37. — Godwin-Austen 1886: 190, pl. 48 figs 4, 4a–c. Alycaeus ( Dicharax) gemmula View in CoL – Kobelt 1902: 370–371. — Gude 1921: 252–253.

Alycaeus ( Dicharax) subhumilis View in CoL – Kobelt 1902: 377. — Gude 1921: 271, pl. 1 figs 1–2.

Alycaeus ( Charax) gemmula View in CoL – Godwin-Austen 1914: 340.

Alycaeus ( Charax) subhumilis – Godwin-Austen 1914: 344–345, pl. 133 figs 2–2c.

Chamalycaeus ( Dicharax) subhumilis View in CoL – Zilch 1957: 146, pl. 6 fig. 24. — Ramakrishna et al. 2010: 67. Chamalycaeus ( Dicharax) gemmula View in CoL – Ramakrishna et al. 2010: 60.

Dicharax (?) gemmula View in CoL – Páll-Gergely et al. 2020: 89 View Cited Treatment .

Dicharax (?) subhumilis View in CoL – Páll-Gergely et al. 2020: 105 View Cited Treatment , fig. 25.

Diagnosis

This species is characterized by a tiny, glossy shell, smooth R2 and a single, sharp R3 swelling, R2+R3 only slightly longer than a quarter whorl.

Type material examined

INDIA • neotype (designated by Preece et al. 2022: Fig. 67A–E); Darjiling; Blanford coll.; NHMUK 1906.4 About NHMUK .4.55 • lectotype of A. subhumilis (designated by Zilch 1957: Fig. 67F–I); Vorderindien: Darjiling; Möllendorff coll.; SMF 109224 About SMF • 1 paralectotype of A. subhumilis ; same data as for preceding; SMF 109225 About SMF .

Type localities

“in valle Rungun” ( A. gemmula ); “in montibus Darjiling Indiae” ( A. subhumilis ).

Differential diagnosis

Dicharax lahupaensis is similar in general shell and aperture shape, but it has two R3 swellings, and its R2 has separate ribs (R3 surface is smooth in D. gemmula ). See also under D. daflaensis .

Remarks

No notable differences were found between the types of A. gemmula and A. subhumilis , therefore the latter is a junior synonym of the former.