Dendostrea frons (frond oyster) (Sanibel Island, Florida, USA) 2

Dendostrea frons (Linnaeus, 1758) - frond oyster shell (interior) from Florida, USA.

Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates.

Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood.

The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record.

Seen here is a frond oyster, a member of Family Ostreidae (Triassic to Holocene). Oysters are filter-feeding, epifaunal, encrusting bivalves that sometimes form reefs. They occupy tropical to temperate estuarine and shallow-water marine settings.

Frond oyster shells vary in shape, which is dictated by the nature of the encrusted substrate - usually gorgonians ("soft corals").

Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Ostreida, Ostreidae

Locality: shoreline of Sanibel Island, Gulf of Mexico coast of southern Florida, USA
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Info. at:
en.wikipedia.org/wiki/Dendostrea_frons

Some rights reserved

Taken on: December 4, 2023

Tags:

Dendostrea

frons

oyster

oysters

shell

shells

bivalve

bivalves

Sanibel

Island

Florida

Ostreidae

Ostreida

Pteriomorphia

Bivalvia

Mollusca « less

Sets appears in: • Oysters (Mollusca, Bivalvia, Ostreidae) • Florida Seashells more » • Sanibel Island, Florida, USA • Bivalves (Modern) « less

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