Bivalvia - Thraciida - Thraciidae
Alternative spelling: Cyathodonta
Parent taxon: Thracia according to O. Mandic and F. F. Steininger 2003
See also Mansfield 1940, Sepkoski 2002, Vokes 1980, Willett 1937 and Woodring 1982
Sister taxa: Thracia (Cetothrax), Thracia (Crassithracia), Thracia (Homoeodesma), Thracia (Ixartia), Thracia (Odoncineta), Thracia (Thracia), Thracia alciope, Thracia applanata, Thracia brioni, Thracia curtansata, Thracia declivis, Thracia depressa, Thracia dilleri, Thracia formosa, Thracia gibsonensis, Thracia grignonensis, Thracia incerta, Thracia jacalitosana, Thracia karquinesensis, Thracia keaseyensis, Thracia kissoumi, Thracia lenticularis, Thracia ludovica, Thracia mactroides, Thracia mactropsis, Thracia oblata, Thracia papyracea, Thracia parvula, Thracia prisca, Thracia proavita, Thracia schencki, Thracia sorrentoensis, Thracia stelcki, Thracia suciensis, Thracia ventricosa, Thracia viceliacensis, Thracia weedi, Eximiothracia perscabrosa
Subtaxa: Cyathodonta dolicha Cyathodonta dubiosa Cyathodonta gatunensis Cyathodonta guadelupensis Cyathodonta pedroana Cyathodonta spenceri Cyathodonta tristani Cyathodonta undulata Cyathodonta weaveri Thracia (Cyathodonta) taylorensis
Distribution:
• Quaternary of Costa Rica (1 collection), Ecuador (1), Mexico (1), United States (9: California, Florida)
• Pliocene of Costa Rica (1), United States (4: California, Florida, South Carolina), Venezuela (4)
• Miocene of Austria (1), Colombia (1), Panama (8), Poland (1), Puerto Rico (4), Venezuela (1)
• Oligocene of Panama (1), United States (2: California, Mississippi)
Total: 40 collections including 41 occurrences