English definition of Mollusca

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Definition of mollusca

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Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and 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 m

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Tectibranchiata :: Tectibranchiata (n. pl.) An order, or suborder, of gastropod Mollusca in which the gills are usually situated on one side of the back, and protected by a fold of the mantle. When there is a shell, it is usually thin and delicate and often rudimentary. The aplysias and the bubble shells are examples..

Mollusk :: Mollusk (n.) One of the Mollusca.

Lamellibranchiata :: Lamellibranchiata (n. pl.) A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc..

Placophora :: Placophora (n. pl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura..

Geophila :: Geophila (n. pl.) The division of Mollusca which includes the land snails and slugs.

Odontoblast :: Odontoblast (n.) One of the cells which secrete the chitinous teeth of Mollusca.

Amphineura :: Amphineura (n. pl.) A division of Mollusca remarkable for the bilateral symmetry of the organs and the arrangement of the nerves.

Encephalous :: Encephalous (a.) Having a head; -- said of most Mollusca; -- opposed to acephalous.

Cirrus :: Cirrus (n.) A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri..

Molluscoidea :: Molluscoidea (n. pl.) A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.

Solenogastra :: Solenogastra (n. pl.) An order of lowly organized Mollusca belonging to the Isopleura. A narrow groove takes the place of the foot of other gastropods.

Opisthopulmonate :: Opisthopulmonate (a.) Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

Molluscan :: Molluscan (n.) A mollusk; one of the Mollusca.

Bojanus Organ :: Bojanus organ () A glandular organ of bivalve mollusca, serving in part as a kidney..

Molluscous :: Molluscous (a.) Molluscan.

Cephalopoda :: Cephalopoda (n. pl.) The highest class of Mollusca.

Anthobranchia :: Anthobranchia (n. pl.) A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. See Nudibranchiata, and Doris..

Acephala :: Acephala (n. pl.) That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca..

Molluscan :: Molluscan (a.) Of or pertaining to mollusks.

Opisthobranchiata :: Opisthobranchiata (n. pl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs..