Vaugonia (Orthotrigonia) sp.

Plate 4, fig. 9

Material.

A single poorly preserved right valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 25).

Description and remarks.

The specimen (H: 22.7 mm, L: 24.5 mm) exhibits the typical ornamentation of Orthotrigonia such as steep subvertical tuberculated ribs on the flank, commarginal tuberculated to spinose ribs in the umbonal area, a tuberculated marginal carina, and a commarginally striated area. The specimen resembles V. (Orthotrigonia) kutchensis (Kitchin, 1903: 84, pl. 8, figs 7-9) from the Kachchh Basin, but due to its poor preservation an identification at the species level is not possible.

Clade Heterodonta Neumayr, 1884

Order Carditida Dall, 1889