Mollusca
Mollusca Mol*lus"ca, prop. n. pl. [NL. See {Mollusk}.] (Zo["o]l.) One of the grand divisions of the animal kingdom, a phylum including the classes Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, and Pelecyopoda (syn. Bivalvia, formerly called Lamellibranchiata, or Conchifera). These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, 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. [1913 Webster +PJC]

Note: Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called Acephala, which was also included under Mollusca. See {Molluscoidea}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Mollusca — 1797, from Mod.L. mollusca, chosen by Linnaeus as the name of an invertebrate order (1758), from neuter plural of L. molluscus thin shelled, from mollis soft (see MELT (Cf. melt) (v.)). Linnæus applied the word to a heterogeneous group of… …   Etymology dictionary

  • Mollusca — Mollusca, s. Weichthiere …   Pierer's Universal-Lexikon

  • Mollusca — Mollusca, Weichtiere, über 130000, in fast allen Lebensräumen vorkommende, zumeist jedoch wasserbewohnende Arten umfassender Stamm der ⇒ Protostomia. Die Coelomsegmentierung und das Coelom selbst, das nur im hinteren Körperabschnitt als Pericard …   Deutsch wörterbuch der biologie

  • Mollusca — Temporal range: Cambrian–Recent …   Wikipedia

  • Mollusca —   Moluscos Rango temporal: Cámbrico Inferior Reciente …   Wikipedia Español

  • Mollusca — Weichtiere Nautilus Systematik Unterreich: Vielzellige Tiere (Metazoa) Abteilung …   Deutsch Wikipedia

  • Mollusca — Mollusque Coquille Sa …   Wikipédia en Français

  • Mollusca — noun gastropods; bivalves; cephalopods; chitons • Syn: ↑phylum Mollusca • Hypernyms: ↑phylum • Member Holonyms: ↑Animalia, ↑kingdom Animalia, ↑animal kingdom …   Useful english dictionary

  • Mollusca — …   Википедия

  • Mollusca — n.; pl. mollusks, molluscs [L. molluscus, soft] A phylum of invertebrates with a soft unsegmented body and usually covered with a double or single shell, or having an internal shell; includes snails, chitons, tusk shells, bivalves, limpets,… …   Dictionary of invertebrate zoology

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