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Costaglycymeris subovata

Geological Range

Early Miocene to Early Pleistocene; Extinct.

Paleogeographic Distribution

Southern Florida to Virginia.


Original Description (from Say, 1824, p. 140):

"Longitudinally short ovate, with about thirty longitudinal impressed acute lines, the intervals a little convex.

Description. Shell increasing in width by a slightly curved line from the apex to beyond the middle: lateral curvatures equal: apices separate, small, central; intervening space with but little obliquity to the plane of the shell, with obsolete angulated lines: teeth forming a regularly and much arcuated series, which is rectilinearly truncated above so as to leave in that part a mere edentulous elevated line: within destitute of striae: margin with elevated angular lines: exterior surface with about thirty longitudinal, impressed, acute lines, the intervals a little convex.

Length from the apex to the base one inch and thirteen-twentieths, breadth one inch and a half nearly.

The character of the interval between the beaks is not unlike that of a Cucullaea, but the arrangement of the teeth does not correspond with the definition of that genus.

This shell varies a little in form, being sometimes nearly orbicular."

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Stratigraphic Occurrences

Early Pleistocene
Bear Bluff Formation (SC)
Caloosahatchee Formation (S. FL)
Chowan River Formation (NC)
Chowan River Formation (VA)
Waccamaw Formation (SC)
Late Pliocene
Croatan Formation (NC)
Duplin Formation (NC)
Duplin / Raysor formations (GA)
Jackson Bluff Formation (N. FL)
Raysor Formation (GA, SC, NC)
Tamiami Formation (S. FL)
Tamiami Formation (Ochopee Limestone) (S. FL)
Tamiami Formation (Pinecrest Beds) (S. FL)
Yorktown Formation (VA)
Early Pliocene
Goose Creek Limestone (GA)
Middle Miocene
St. Marys Formation (VA) (Age not resolved beyond "Miocene")
Early Miocene
Chipola Formation (N. FL)
<i>Costaglycymeris subovata</i> from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Okeechobee County, Florida (UF 203945).
Costaglycymeris subovata from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Okeechobee County, Florida (UF 203945).
Early Pleistocene Map
Early Pleistocene Map
Late Pliocene Map
Late Pliocene Map
Early Pliocene Map
Early Pliocene Map
Middle Miocene Map
Middle Miocene Map
Early Miocene Map
Early Miocene Map<