Acila (Acila) shimoyamai Oyama and Mizuno 1958 (divaricate nutclam)

Bivalvia - Nuculida - Nuculidae

Full reference: K. Oyama and A. Mizuno. 1958. n the New Forms of Paleogene Molluscs from Japan. Bulletin of the Geological Survey of Japan 9:589-606

Belongs to Acila (Acila) according to K. Oyama and A. Mizuno 1958

Sister taxa: Acila (Acila) brevis, Acila (Acila) divaricata, Acila (Acila) gettysburgensis, Acila (Acila) isthmica, Acila (Acila) kholmskensis, Acila (Acila) mirabilis, Acila (Acila) praedivaricata, Acila (Acila) semirostrata, Acila (Acila) submirabilis, Acila (Acila) vigilia

Type specimen: GSJ 5017, a shell

Ecology: facultatively mobile infaunal deposit feeder-suspension feeder

Distribution: found only at Akabira Formation, Ishikari Group (Eocene of Japan)

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