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. 4

( Fig. 20J )

Material. One specimen: ESKU-19- LP 52.

Dimensions (mm): ESKU-19- LP 52: height = 6.0; width = 8.0; apical angle = 126 º; apertural height = 4.2; apertural width = 5.2.

Remarks. The present specimen is low-spired with the spire only somewhat protruding, consisting of three smooth rapidly increasing whorls. The body-whorl is very inflated, the height of the last whorl is about 90% of the total shell height. The aperture is broad with a thick inductura and seems to develop a columellar fold which has never been observed in Naticopsis . However, the preservation of the aperture is insufficient to be sure that a fold is really present.

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).