The bivalve genus <i>Grammatodon</i> from the Middle Jurassic of the Catlins district, South Otago, New Zealand

Abstract

Abstract The bivalve genus Grammatodon is described from the Temaikan Stage (Middle Jurassic; Aalenian to Callovian) of South Otago, New Zealand. It is represented by three new species of the subgenus Indogrammatodon , and one described species of the subgenus Cosmetodon . An overview of the stratigraphy and associated paleontology is provided for the five principal locations where species of Grammatodon have been collected. Paleobiogeography is discussed in general terms. Interpretations based on taxonomic features are given for the mode of life of the Indogrammatodon species.