Naticopsis, McCoy, 1844

Ketwetsuriya, Chatchalerm, Karapunar, Baran, Charoentitirat, Thasinee & Nützel, Al- Exander, 2020, Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane, Zootaxa 4766 (1), pp. 1-47 : 28

Naticopsis ? sp. 3

( Fig. 20 G–I)

Material. One specimen: ESKU-19- LP 32.

Dimensions (mm): ESKU-19- LP 32: height = 5.3; width = 7.8; apical angle = 108 º.

Description. Shell flatly turbiniform to naticiform with about three whorls (apex missing); spire elevated; rate of whorl expansion rapidly increasing; body-whorl broad, approximately 70% of the entire height; whorls rounded, strongly convex, with undulating, irregular axial ribs; base rounded; aperture unknown.

Remarks. The undulating, irregular axial ribs on the whorl surface and the broader body-whorl distinguish Naticopsis sp. 3 from the others present in this fauna. It might represent a new species, but the poor preservation prevents a further taxonomic assignment.

Figures

FIGURE 20. A–C, Naticopsis sp. 1, ESKU-19-LP 47. D–F, Naticopsis sp. 2, ESKU-19-LP 46. G–I, Naticopsis? sp. 3, ESKU- 19-LP 32. J, Naticopsis? sp. 4, ESKU-19-LP 52. K–L, Naticopsis cf. heshanensis Pan & Erwin, 2002, ESKU-19-LP 44. Scale bars represent: 2 mm (A–J); 5 mm (K–L).