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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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..
Stomatoplastic ::
Stomatogastric (a.) Of or pertaining to the mouth and the stomach; as, the stomatogastric ganglion of certain Mollusca..
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..
Sublapsarian ::
Subkingdom (n.) One of the several primary divisions of either the animal, or vegetable kingdom, as, in zoology, the Vertebrata, Tunicata, Mollusca, Articulata, Molluscoidea, Echinodermata, Coelentera, and the Protozoa; in botany, the Phanerogamia, and the Cryptogamia..
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..
Conchology ::
Conchology (n.) The science of Mollusca, and of the shells which they form; malacology..
Cirrobranchiata ::
Cirrobranchiata (n. pl.) A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda..
Opisthopulmonate ::
Opisthopulmonate (a.) Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.
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..
Hepato-pancreas ::
Hepato-pancreas (n.) A digestive gland in Crustacea, Mollusca, etc., usually called the liver, but different from the liver of vertebrates..
Bojanus Organ ::
Bojanus organ () A glandular organ of bivalve mollusca, serving in part as a kidney..
Carinaria ::
Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..
Osphradium ::
Osphradium (n.) The olfactory organ of some Mollusca. It is connected with the organ of respiration.
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..
Cambrian ::
Cambrian (a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.
Ceratobranchia ::
Ceratobranchia (n. pl.) A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.
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