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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 multivalve.
- Molluscan - a. - Of or pertaining to mollusks.
- Molluscan - n. - A mollusk; one of the Mollusca.
- 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.
- 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.
- Amphineura - n. pl. - A division of Mollusca remarkable for the bilateral symmetry of the organs and the arrangement of the nerves.
- Cirrobranchiata - n. pl. - A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda.
- Conchifera - n. pl. - That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.
- 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.
- Lamellibranchiata - n. pl. - A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc.
- 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.
- Ostrea - n. - A genus of bivalve Mollusca which includes the true oysters.
- 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.
- 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.
- Ceratobranchia - n. pl. - A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.
- Geophila - n. pl. - The division of Mollusca which includes the land snails and slugs.