Taxonomic comments on subfamily Ostreinae Rafinesque

Abstract

In the light of the present authors' work on subfamily Ostreinae from the Cretaceous of India, it was felt desirable that the two informal groups non-incubatory and iacubatory genera of Stenzel in this Subfamily, be raised to the status of tribes as Crassostreini and Ostreini respectively on par with tribe Flemingostreiai Stenzel. Also two new non-incubatory genera Cussetostrea and Soleniscostrea are proposed here based on the type species as Crassostrea cusseta Sohl and Kauffman and Crassostrea soleniscus (Meek) respectively.

Middle Cretaceous (Cenomanian) bivalves from the Karai Formation, Uttattur Group, of the Cauvery Basin, south India

“…Among "widespread Pacific or trans-temperate bivaIves ... common in east African province" (Kauffmann 1973: 374 (Kauffmann 1973: 359-372 Formation are either cosmopolitan in character or are widely distributed in both Austral and Mediterran-Caucasian Realms of both hemispheres. A similar conclusion for the biogeographic character of the entire south Indian Cretaceous was reached by Chiplonkar and Tapaswi (1979). An endemic element in the assemblage, defined as that apparently confined to the Cauvery Basin, if confirmed, would comprise a small minority of genera, not exceeding 5% of the total.…”