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Anadara callicestosa

Geological Range

Late Pliocene to Early Pleistocene; Extinct.

Paleogeographic Distribution

Southern Florida to Virginia.


Original Description (from Dall, 1898, p. 638-639):

"Upper bed (Miocene) at Gaskin's Wharf, on the Nansemond River, sixteen miles below Suffolk, Virginia; F. Burns.

Shell of moderate size, rather thin, rhomboidal, with small, prominent, mediosulcate, prosocoelous beaks situated at about the anterior third of its length; left valve with about thirty-seven squarish subequal radial ribs, separated by narrower channelled interspaces; on the tops of these ribs are four longitudinal threads, the inner pair larger and more prominent but separated by a somewhat deeper sulcus than those external to the inner threads; concentric sculpture of fine, close, rounded, slightly elevated threads, which overrun the whole shell, ribs, and interspaces, and at short intervals, at the intersection with the inner pair of rib-threads, they become minutely nodulous, while the reticulations have a punctate appearance, giving a surface somewhat like fine lace and peculiar, as far as observed, to this species; cardinal area short, rather narrow, with sharply elevated boundaries and a single incised set of grooves forming a lozenge-shaped figure anteriorly; hinge-line short, teeth in two adjacent series, anterior with fifteen, posterior with twenty-six or twenty-seven teeth set vertically, a little oblique at the distal ends of the series; each individual tooth more or less grooved or striate in the direction of motion, as in some recent species; anterior end of shell produced, rounded; posterior end subtruncate, base slightly arched; inner margin of the valves with rather long, deep flutings, corresponding to the external ribs. Lon. 32, alt. 27, diam. 20 mm. (twice the diameter of the single valve).

A single valve of this very elegant species was obtained by Mr. Burns. Its sculpture differentiates it from all our other Tertiary species. Arca callipleura Conrad, in which the ribs have a minute nodular sculpture, has the radial threading predominant, while in this species the concentric threads overrun all the rest. The two species are entirely distinct otherwise."

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Stratigraphic Occurrences

Early Pleistocene
Waccamaw Formation (NC)
Late Pliocene
Duplin Formation (NC)
Jackson Bluff Formation (N. FL)
Tamiami Formation (Pinecrest Beds) (S. FL)
Yorktown Formation (VA)
<i>Anadara callicestosa</i> from the Pliocene Tamiami Formation (Pinecrest Beds) of Sarasota County, Florida (UF 176406).
Anadara callicestosa from the Pliocene Tamiami Formation (Pinecrest Beds) of Sarasota County, Florida (UF 176406).
Specimen of <i>Anadara callicestosa</i> figured by Dall (1898, pl. 34, fig. 17 and 18); 32.0 mm in length.
Specimen of Anadara callicestosa figured by Dall (1898, pl. 34, fig. 17 and 18); 32.0 mm in length.
Early Pleistocene Map
Early Pleistocene Map
Late Pliocene Map
Late Pliocene Map