Abstract
A new fossil marine diatom resting spore morphogenus (form genus) Truncatulus I. Suto gen. nov. is described using samples from DSDP Site 338 in the Norwegian Sea, Sites 436 and 438 in the northwest Pacific Ocean and from the onland Newport Beach Section, California. Truncatulus is characterized by the circular, elliptical or polygonal flat plate on the truncated elevation of the oval to elliptic epivalve or/and hypovalve, and includes seven new species (T. simplex, T. atlan
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