Palaeostylus, Mansuy, 1914

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 : 36

Palaeostylus sp.

( Fig. 24 A–B)

Material. One specimen: ESKU-19- LP 7.

Dimensions (mm): ESKU-19- LP 7: height = 3.6; width = 2.2; apical angle = 84 º.

Remarks. This small, high-spired, cyrtoconoid, shell has a straight whorl face that is ornamented by slightly opisthocline axial ribs, forming node-like extensions situated immediately adjacent to the adapical suture. The whorls are low as is typical for the genus Palaeoestylus. Similar shells do also occur in the genera Pseudozygopleura Knight, 1930 and Zygopleura Koken, 1892 . The present specimen is too fragmentary for an identification.

Figures

FIGURE 24. A–B, Palaeostylus sp., ESKU-19-LP 7. C–D, Pseudozygopleura? sp., ESKU-19-LP 63. Scale bars represent: 1 mm (A–B); 2 mm (C–D).