Dicharax conicus ( Godwin-Austen, 1871 )

Dicharax conicus ( Godwin-Austen, 1871) View in CoL

Fig. 42

Alycaeus conicus Godwin-Austen, 1871: 87–88 View in CoL , pl. 3 fig. 1.

Alycaeus conicus var. nanus Godwin-Austen, 1914: 388 View in CoL , pl. 138 figs 6, 6a–b. Syn. nov.

Dicharax conicus jatingaensis Páll-Gergely View in CoL in Páll-Gergely et al., 2020: 56 View Cited Treatment (replacement name for Alycaeus conicus var. nanus Godwin-Austen, 1914 View in CoL , non Alycaeus nanus Möllendorff, 1886 View in CoL )

Alycaeus conicus View in CoL – Sowerby 1877: pl. 1, species 9. — Godwin-Austen 1914: 387–388, pl. 143 figs 4, 4a–b. — Gude 1921: 208.

Alycaeus ( Alycaeus) conicus View in CoL – Kobelt 1902: 342. — Ramakrishna et al. 2010: 47.

Alycaeus conicus var. nana – Gude 1921: 208.

Dicharax conicus View in CoL – Páll-Gergely et al. 2020: 45 View Cited Treatment .

Diagnosis

Besides the elevated spire, this species can be distinguished from its congeners based on the nearly smooth R1, and the peculiar outer peristome, which is strongly expanded and turns anteriorly.

Type material examined

INDIA • 12 syntypes of A. conicus ( Fig. 42A–E); Samiamri, E of the Kopili R.; Godwin-Austen leg.; NHMUK 1903.7 About NHMUK .1.2674 • 12 syntypes of A. conicus var. nanus ( Fig. 42F–J); Jatinga Valley , N. Cachar; NHMUK 1903.7 About NHMUK .1.2675 .

Additional material examined

INDIA • 1 shell (included with type lot, but not mentioned in the original description and not considered as part of the type series); Khasi Hills; NHMUK 1903.7 About NHMUK .1.2565 .

Type localities

“Was abundant on the Limestone Hill east of Kopili river, North Cachar District, and was occasionally also found in other places, but rare” ( A. conicus ); “Jatinga Valley, North Cachar Hills” ( A. conicus var. nanus ).

Remarks

Besides a slight difference in shell size, we found no important conchological traits that differ between A. conicus and A. conicus var. nanus ; therefore, we see no reason to maintain the latter as a subspecies.