: a horny band or ribbon in mollusks other than bivalves that bears minute chitinous teeth on its dorsal surface and scrapes or tears off food and draws it into the mouth - Radula, : a chitinous layer covering the exterior of the shell in many mollusks, being usually well developed in freshwater forms, and serving to protect the shell from corrosion - Periostracum, : the hard pearly iridescent substance forming the inner layer of a mollusk shell - Nacre, : blood flows freely through cavities since there are no vessels to conduct the blood - Open Circulatory System, : a larval mollusk in the stage when it has developed the velum - Veliger, : the gill of a mollusk consisting typically of a respiratory structure that resembles a comb or feather, has a main stem with lateral lamellae, and is developed from the inner side of the mantle  - Ctenidia, : of or relating to the right : inclined to the right: such as - Dextral, : of, relating to, or inclined to the left: such as - Sinistral, : the uppermost point : VERTEX - Apex, : an opening or open space : HOLE - Aperture, : a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects - Mucus, : that part of a bodily organ by which it is attached to another more central structure of the organism - Base, : a horny or shelly plate on the posterior dorsal surface of the foot in many gastropod mollusks that closes the shell when the animal is retracted - Operculum, : the twisting or wrenching of a body by the exertion of forces tending to turn one end or part about a longitudinal axis while the other is held fast or turned in the opposite direction - Torsion, : any of various elongated or extensible tubular processes (such as the sucking organ of a butterfly) of the oral region of an invertebrate - Proboscis, : a rounded elevation: such as - Umbo, : The siphon which takes in water is called the incurrent, or inhalant siphon - Incurrent Siphon, : the shell of a cuttlefish that is sometimes used for polishing powder or for supplying cage birds with lime and salts - Cuttlebone, : a pigment-bearing cell - Chromatophores, : a brown melanin-containing pigment from the ink of cuttlefishes - Sepia,

Zoology

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