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Univalve

univalve

(Science: zoology) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.

most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods. A large number of univalves belonging to the gastropods are conical, cup-shaped, or shieldlike, as the limpets.

Origin: Uni- _ valve: cf. F. Univalve.


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Moluscus and Arthropods

... which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called ...

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by kandarp shah
Sun Jul 17, 2005 5:45 pm
 
Forum: Zoology Discussion
Topic: Moluscus and Arthropods
Replies: 6
Views: 5983

Moluscus and Arthropods

... which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called ...

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by mith
Sun Jul 17, 2005 2:10 pm
 
Forum: Zoology Discussion
Topic: Moluscus and Arthropods
Replies: 6
Views: 5983


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