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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Cephalata :: Cephalata (n. pl.) A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix..

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..

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..

Conchology :: Conchology (n.) The science of Mollusca, and of the shells which they form; malacology..

Molluscous :: Molluscous (a.) Molluscan.

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.

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

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..

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

Ostrea :: Ostrea (n.) A genus of bivalve Mollusca which includes the true oysters.

Gastropoda :: Gastropoda (n. pl.) One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, and the land and fresh-water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca..

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

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

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

Bivalve :: Bivalve (n.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca..

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

Osphradium :: Osphradium (n.) The olfactory organ of some Mollusca. It is connected with the organ of respiration.

Stomatoplastic :: Stomatogastric (a.) Of or pertaining to the mouth and the stomach; as, the stomatogastric ganglion of certain Mollusca..

Streptothrix :: Streptoneura (n. pl.) An extensive division of gastropod Mollusca in which the loop or visceral nerves is twisted, and the sexes separate. It is nearly to equivalent to Prosobranchiata..

Pteropoda :: Pteropoda (n. pl.) A class of Mollusca in which the anterior lobes of the foot are developed in the form of broad, thin, winglike organs, with which they swim at near the surface of the sea..