Cyrtodontula umbonata

Phylum: Mollusca
Class: Bivalvia
Order: Arcoida
Family: Cyrtodontidae
Genus: Cyrtodontula
Species: Cyrtodontula umbonata Ulrich, 1895

Stratigraphic Occurrences

C. umbonata_strat

Geographic Occurrences

Map point data provided by iDigBio.

Stratigraphic Description

Sequences (Formations)

  • C5 Sequence (Lower Whitewater, Waynesville)

Identification in Hand Sample

Cyrtodontula umbonata from the Whitewater Formation of Richmond, Indiana (OUIP 1847)

Published Description

Davis (1998):

  • Pelecypod. Identified by large size, by broad, prominent beaks, by the characteristic angle of the hinge line and by the posterior shape of the shell. Whitewater.

Fossils of Ohio (1996):

  • The Ordovician genus Cyrtodonula is represented by C. umbonata (Ulrich), which is medium sized and has prominent beaks and a truncate posterior margin