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, Moore 1963, Stewart 1930 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 Portlandia (Portlandella) reagani
Type: Leda rosa
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), United States (2: Washington)
• Eocene of the Russian Federation (8)
• Paleocene of the Russian Federation (2)
• Cretaceous of Serbia and Montenegro (1)
Total: 46 collections including 62 occurrences