Coptocheilus Gould, 1862

Jirapatrasilp, Parin, Sutcharit, Chirasak & Panha, Somsak, 2022, Annotated checklist of the operculated land snails from Thailand (Mollusca, Gastropoda, Caenogastropoda): the family Pupinidae, with descriptions of several new species and subspecies, and notes on classification of Pupina Vignard, 1829 and Pupinella Gray, 1850 from mainland Southeast Asia, ZooKeys 1119, pp. 1-115 : 1

1. Genus Coptocheilus Gould, 1862

Coptocheilus Gould, 1862: 282.

Schistoloma Kobelt, 1902: 278. Egorov 2013: 14.

Type species.

Cyclostoma altum Sowerby I, 1842, by original designation.

Diagnosis.

Shell high conical to elongate ovate. Sculpture mostly smooth, rarely ribbed. Periumbilical keel either present or absent. Aperture round without any tubes or apparent slits, sometimes with a slight angular indentation at peristome upper junction. Operculum thin, flat, closely coiled.

Differential diagnosis.

Shell size and matt surface of Coptocheilus are more similar to Tortulosa than other genera in this subfamily. However, Coptocheilus is different from Tortulosa in having a round aperture without any tubes or apparent slits, but sometimes with a slight angular indentation at the upper junction of peristome. In addition, Coptocheilus has a thin, flat operculum, and does not have a periumbilical keel ( Kobelt 1902).

Remarks.

For the resurrection of Coptocheilus Gould, 1862 over Schistoloma Kobelt, 1902 and the list of all Coptocheilus species, see Bui and Páll-Gergely (2020). The distribution of Coptocheilus species in Thailand is provided in Fig. 4 .

Figures

Figure 4. Map of southern Thailand showing the distribution of Coptocheilus sectilabris (filled square), Coptocheilus sumatranus (open square), Rhaphaulus lorraini (filled star), Rhaphaulus ascendens (open star), Rhaphaulus perakensis (asterisk), and Tortulosa tortuosa (circle). Each red symbol indicates the type locality of its respective taxon. Red circles indicate the type localities of Tortulosa huberi (1) and Tortulosa schileykoi (2).