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Agnocardia acrocome

Geological Range

Early Miocene; Extinct.

Paleogeographic Distribution

Northern Florida.

Remarks

Original Description (from Dall, 1900, p. 1081):

"Oligocene marl of the Chipola River, Calhoun County, Florida; Burns.

Shell small, rotund, plump, nearly equilateral, with moderately full umbones; sculpture of about forty-five close-set, low, nearly flat radial ribs separated by very narrow channelled interspaces; the alternate ribs anteriorly surmounted with prominent hollow spines usually truncate at the ends, their alternates showing low A-shaped spines; behind the middle of the shell the long-spined ribs are less numerous and on the posterior area nearly all the ribs have low spines; there is no smooth area near the hinge-margin; internally the margins are fluted or serrate minutely, and the shell radially sulcate near the margin; hinge normal, delicate. Alt. 7.5, Ion. 7.5, diam. 6 mm.

Only a single valve of this very distinct little species was obtained. Owing to the alternation in the sculpture it has somewhat the aspect of Criocardium."

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Stratigraphic Occurrences

Early Miocene
Chipola Formation (N. FL)
<i>Agnocardia acrocome</i> from the Early Miocene Chipola Formation of Calhoun County, Florida (UF 96430).
Agnocardia acrocome from the Early Miocene Chipola Formation of Calhoun County, Florida (UF 96430).
Specimen of <i>Agnocardia acrocome</i> figured by Dall (1900, pl. 48, fig. 2); 8.0 mm in length.
Specimen of Agnocardia acrocome figured by Dall (1900, pl. 48, fig. 2); 8.0 mm in length.
Early Miocene Map
Early Miocene Map<