Bivalvia - Cardiida - Semelidae
Alternative spelling: Syndosmya
Parent taxon: Abra according to P. Jeffery and S. Tracey 1997
See also Deshayes 1857 and Sepkoski 2002
Sister taxa: Abra (Abra), Abra (Iacra), Abra aequalis, Abra alba, Abra angulata, Abra antwerpiensis, Abra deshayesi, Abra fabalis, Abra marylandica, Abra nitens, Abra obovalis, Abra recluzii, Abra suessoniensis, Abra uruguayensis
Subtaxa: Abra (Syndosmya) cygnea Abra (Syndosmya) splendens Syndosmya deltoidea Syndosmya depressa Syndosmya difficialis Syndosmya exilis Syndosmya lamberti Syndosmya macrodonta Syndosmya media Syndosmya obtusa Syndosmya striatula
Ecology: facultatively mobile infaunal deposit feeder-suspension feeder
Distribution:
• Eocene of the United Kingdom (5 collections)
Total: 5 collections each including a single occurrence