discoideus (Sowerby I, 1843)

Sutcharit, Chirasak, Ablett, Jonathan D. & Panha, Somsak, 2019, An annotated type catalogue of seven genera of operculate land snails (Caenogastropoda, Cyclophoridae) in the Natural History Museum, London, ZooKeys 842, pp. 1-65 : 1

36. discoideus (Sowerby I, 1843) Fig. 5D, E

Cyclostoma discoideum Sowerby I, 1843a: 111, pl. 25, figs 87, 88. Pfeiffer 1849: 144, 145, pl. 20, figs 1-3.

Cyclotus discoideus - Reeve 1863: volume 14, Cyclotus , pl. 5, species 23. Kobelt 1902: 190, 191.

Current generic position.

Cyclotus Swainson, 1840

Type locality.

Demerara.

Type material.

Syntype NHMUK 20170358 (2 shells; Fig. 5D, E).

Remarks.

The original description and illustration in Sowerby I (1843a) as well as those in Pfeiffer (1849) and Reeve (1863) are particularly accurate, both showing the varices on the last whorl, which suggests that these figures are from the same specimen. The NHM collections contain a lot of two shells from the Cuming collection with original labels stating the taxon name and collection locality. The specimen that corresponds to the illustrations in Sowerby I (1843a), Pfeiffer (1849) and Reeve (1863) is figured herein (Fig. 5D).