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Armimiltha disciformis

Geological Range

Late Pliocene to Middle Pleistocene; Extinct.

Paleogeographic Distribution

Southern Florida.

Remarks

Original Description (from Heilprin, 1886, p. 94):

"Shell compressed, suborbicular, higher than broad, flattened on the umbonal slope; beak subcentral, acute, overlooking a deeply impressed lunule; ligamental sulcus profound; cartilage-pit oblique; cardinal teeth two in each valve, the posterior in the right valve, and the anterior in the left valve, bifid; anterior margin of shell impressed somewhat above the middle; muscular impressions elevated, the anterior ribbon-form, long and narrow, departing somewhat from the rather distantly separated pallial line; external surface ornamented with numerous distantly placed lines of growth, which at nearly equal intervals rise into rugose elevated lamellae; interior of shell longitudinally rugated.

Height, 2.5 inches; width, 2.4 inches.

This shell bears a similarity of outline to the Miocene Lucina Americana (L. anodonta), and is barely distinguishable from that species by external characters alone; the latter is, however, edentulous. Among recent forms it approximates L. Childreni, but that species is inequivalve."

Stratigraphic Occurrences

Middle Pleistocene
Bermont Formation (S. FL)
Early Pleistocene
Caloosahatchee Formation (S. FL)
Late Pliocene
Tamiami Formation (Buckingham Limestone) (S. FL)
Tamiami Formation (Pinecrest Beds) (S. FL)
<i>Armimiltha disciformis</i> from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Sarasota County, Florida (UF 145357).
Armimiltha disciformis from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Sarasota County, Florida (UF 145357).
Specimen of <i>Armimiltha disciformis</i> figured by Heilprin (1886, pl. 11, fig. 28); 2.5 in. in length.
Specimen of Armimiltha disciformis figured by Heilprin (1886, pl. 11, fig. 28); 2.5 in. in length.
<i>Armimiltha disciformis</i> from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Sarasota County, Florida (PRI 70175).
Armimiltha disciformis from the Late Pliocene Tamiami Fm. (Pinecrest Beds) of Sarasota County, Florida (PRI 70175).
Middle Pleistocene Map
Middle Pleistocene Map
Early Pleistocene Map
Early Pleistocene Map
Late Pliocene Map
Late Pliocene Map