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Suto, I. (2006). Truncatulus gen. nov., a new fossil resting spore morphogenus related to the marine diatom genus Chaetoceros (Bacillariophyceae). Phycologia. 45(5): 585-601.

240143

10.2216/04-91.1 [view]

Suto, I.

2006

45(5): 585-601

Publication

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. atlanticus, T. ellipticus, T. norvegicus, T. californicus and T. hajosiae), and one new combination, T. tortonicus (Hajós) I. Suto. Truncatulus appeared in the early Oligocene and became extinct in the late Pliocene. The oldest species, T. ellipticus, arose in the early Oligocene. Truncatulus norvegicus, T. ellipticus, T. atlanticus and T. hajosiae might be endemic species in the Norwegian Sea, and the first and last occurrences of T. norvegicus and the first occurrences of T. ellipticus, T. atlanticus and T. hajosiae may be useful for North Atlantic diatom biostratigraphy. Truncatulus californicus is endemic in the northeastern Pacific and restricted to a relatively short interval in middle Miocene Zone NPD 5B; it is therefore an excellent stratigraphic marker for this horizon. The last and cosmopolitan species T. tortonicus became extinct in the late Pliocene in the northwestern Pacific.

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