Stuck on a problem? Get great tutoring at an affordable price with Chegg. Click here to join and get your 1st 30 minutes Free!

Mollusca

From Biology-Online Dictionary
Jump to: navigation, search

mollusca

(Science: zoology) 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.

Formerly the brachiopoda, Bryzoa, and tunicata were united with the lamellibranchiata in an artificial group called acephala, which was also included under Mollusca. See Molluscoudea.