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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Hepato-pancreas ::
Hepato-pancreas (n.) A digestive gland in Crustacea, Mollusca, etc., usually called the liver, but different from the liver of vertebrates..
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.
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..
Molluscoidea ::
Molluscoidea (n. pl.) A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.
Conchology ::
Conchology (n.) The science of Mollusca, and of the shells which they form; malacology..
Scaphopda ::
Scaphopda (n. pl.) A class of marine cephalate Mollusca having a tubular shell open at both ends, a pointed or spadelike foot for burrowing, and many long, slender, prehensile oral tentacles. It includes Dentalium, or the tooth shells, and other similar shells. Called also Prosopocephala, and Solenoconcha..
Lamellibranchiata ::
Lamellibranchiata (n. pl.) A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc..
Carinaria ::
Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..
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..
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..
Scutibranchiata ::
Scutibranchiata (n. pl.) An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.
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..
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..
Bojanus Organ ::
Bojanus organ () A glandular organ of bivalve mollusca, serving in part as a kidney..
Cirrobranchiata ::
Cirrobranchiata (n. pl.) A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda..
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