A New Species of Fossil Nuttallia (Mollusca: Bivalvia) from the Pliocene of Sonoma County, California
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Nuttallia jamesi, new species, is described from strata assigned Pliocene age in the Sebastopol quadrangle, central Sonoma County, California. The species is similar to N. nuttallii (Conrad), late Miocene to Recent of California and Baja California, and to N. olivacea (Jay), Miocene to Recent of Japan, but differs from both in having an acuminate posterior end. The genus Nuttallia is restricted, in both Recent and fossil occurrence, to the north Pacific basin. It represents a temperately adapted branch of the predominantly tropical Sanguinolariinae.