Coronodiscus gen. nov., a new diatom resting spore genus from the North Pacific and Norwegian Sea

Abstract

Fossil marine diatom resting spore m orpho-genus Coronodiscus gen. nov. is described using samples from DSDP Site 338 in the Norwegian Sea, Sites 436 and 438 in the northwest Pacific and from the Newport Beach Section, California. Coronodiscus is characterized by having sheathes surrounding the epivalve and hypovalve which possess rows of elongate simple pores. This genus contains two species: C. collarius sp. nov. and C. trigonus sp. nov. Coronodiscus trigonus is differentiated from C. collarius by having a sheath possessing a triangular process.