Megayoldia (Portlandella) Stewart 1930 (clam)

Bivalvia - Nuculanida - Sareptidae

Alternative spellings: Portlandella, Portlandia (Portlandella), Yoldia (Portlandella)

Full reference: R. B. Stewart. 1930. Gabb's California Cretaceous and Tertiary type lamellibranchs. The Academy of Natural Sciences of Philadelphia Special Publication 3:1-314

Parent taxon: Megayoldia according to A. I. Kafanov et al. 2001

See also Coan et al. 2000, Kafanov and Ogasawara 2003 and Woodring 1973

Sister taxa: Megayoldia (Hataiyoldia), Megayoldia (Megayoldia), Yoldia (Megayoldia) martyria, Yoldia (Megayoldia) montereyensis

Subtaxa: Megayoldia (Portlandella) pilvoensis Megayoldia (Portlandella) watasei Portlandia (Portlandella) euthynta

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Ecology: facultatively mobile infaunal deposit feeder

Distribution:

• Pliocene of Japan (5 collections), the Russian Federation (1)

• Miocene of Japan (3), the Russian Federation (8)

• Oligocene to Miocene of the Russian Federation (2)

• Oligocene of Panama (1), the Russian Federation (13)

• Eocene of the Russian Federation (8)

• Paleocene of the Russian Federation (2)

• Cretaceous of Serbia and Montenegro (1)

Total: 44 collections including 60 occurrences

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