Hippocardia cunea (fossil rostroconch) in fossiliferous limestone (probably from the Columbus Limestone, Middle Devonian; probably Ohio, USA) 5

Hippocardia cunea (Conrad, 1840) - fossil rostroconch in Devonian limestone.

This species is also known as Hoareicardia cunea.

Rostroconchs are an extinct class of molluscs. They are restricted to the Paleozoic - they first appear in Lower Cambrian rocks and go extinct in the Upper Permian. Rostroconchs somewhat resemble bivalves (= clams & relatives), but they are actually pseudobivalved. They have a continuous, univalved, calcareous shell roughly shaped like a taco. As the organism grows, it breaks the shell along a "hinge line" and recements the shell together. This can be seen as tiny breaks and cracks that have been resealed. True bivalves have two separate calcareous shells held together by organic material. Bivalves can readily open and shut their shells.

Rostroconchs had an inferred semi-infaunal lifestyle and, as a group, were likely deposit feeders or filter feeders or both. They had a permanent anterior gape (open space between the edges of the "two" shells and a posterior rostrum (= tubular extension of the shell). Some rostroconchs had a hood - an extension of shell material around the rostrum. The soft-part anatomy was probably clam-like. They had their greatest diversity during the Early Ordovician.

Classification: Animalia, Mollusca, Rostroconchia, Conocardiida, Hippocardiidae

Stratigraphy: unknown (but probably from the Columbus Limestone, Eifelian Stage, lower Middle Devonian)

Locality: unknown (but probably from Ohio, USA)
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See info. at:
en.wikipedia.org/wiki/Rostroconchia

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Taken on: May 3, 2023

Tags:

Hippocardia

cunea

Hippocardiidae

Conocardiida

Rostroconchia

rostroconch

rostroconchs

Devonian

limestone

Ohio

Columbus

mollusc

molluscs

fossil

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Sets appears in: • Rostroconch Fossils

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