Cladoceramus

Cladoceramus; Temporal range: Late Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Pteriida
Family:	†Inoceramidae
Genus:	†Cladoceramus; Seitz 1961
Species
	C. undulatoplicatus Roemer 1852;

Cladoceramus is an

extant genus Pteria. They lived in the Santonian stage of the Late Cretaceous

.

Description

Adult shells of Cladoceramus are small to very large size (more than 1 metre [3 ft 3 in] in length).[1] Many species with fine, discrete, juvenile ornamentation on umbo, consisting of closely and evenly to subevenly spaced raised concentric growth lines without rugae. Posterior auricle well-defined, triangular, separated from disc by auricular sulcus; a post-umbonal sulcus occurs in some species, as do very small anterior auricles ("ears").^[1]

Biostratigraphic significance

The first appearance of the species Cladoceramus undulatoplicatus marks the beginning of the Santonian stage.

Distribution

Fossils of the genus have been found in:^[2]

Matulla Formation, Egypt

United States

Forbes Shale, California
Smoky Hill Shale, Niobrara Formation, Colorado and New Mexico
Austin Chalk, Texas
Mancos Shale, Wyoming

References

^ ^a ^b Lower Turonian Euramerican Inoceramidae: A morphologic, taxonomic, and biostratigraphic overview. A report from the first Workshop on Early Turonian Inoceramids (Oct. 5-8, 1992) in Hamburg, Germany; organized by Heinz Hilbrecht and Peter J. Harries
^ Cladoceramus at Fossilworks.org

[Hilbrecht1992-1] Lower Turonian Euramerican Inoceramidae: A morphologic, taxonomic, and biostratigraphic overview. A report from the first Workshop on Early Turonian Inoceramids (Oct. 5-8, 1992) in Hamburg, Germany; organized by Heinz Hilbrecht and Peter J. Harries

[FW-2] Cladoceramus at Fossilworks.org

[1]

[2]