Permian gastropods from Perak, Malaysia. Part 2, The trochids, patellids and neritids. American Museum novitates ; no. 2685

Abstract

"This is a continuation of a study of Permian gastropods from the misellina claudiae zone from the H.S. Lee Mine no. 8 near Kampar, Perak, Malaysia. The fauna constitutes one of the richest, most diverse known in the Permian, providing a critical base in the eastern Tethys. New species of Sallya Yochelson, 1956, and Dichostasia Yochelson, 1956, record their presence for the first time outside of the west Texas region. One species of patellids is recorded, 10 species of trochids, four new, and nine species of neritids, three new, are described. Most of the neritids are similar to morphotypes found from Djebel Tebaga east to Mongolia. Key characters in Trachydomia imbricata, new species, suggest an ancestral relationship to Neritopsis. Wall ultrastructure is reported and discussed for Trachyspira delphinuloides Gemmellaro, 1889, and for the Recent Neritopsis radula Linné, 1758"--P. [1].