Bivalvia

Rarity: Rare

A topic known well beyond its field, found in many languages.

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What Wikipedia says

Bivalvia () or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves.

Excerpt from the Wikipedia article “Bivalvia”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, CC BY 2.5, via Wikimedia Commons.