helicocone
adj. [Gr. helix, a spiral; konos, cone-like]
(MOLLUSCA: Gastropoda)
An expanding cone-like spiral tube that is the form of most shells.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • whorl — n. [A.S. hweorfan, to turn] (MOLLUSCA: Gastropoda) 1. Any complete coil of a helicocone. 2. The exposed surface of any complete coil of a helicocone …   Dictionary of invertebrate zoology

  • last whorl — (MOLLUSCA: Gastropoda) In coiled shells, last formed complete volution of a helicocone …   Dictionary of invertebrate zoology

  • opisthocline — adj. [Gr. opisthen, behind; clinein, to lean] 1. Leaning backward. 2. (MOLLUSCA: Gastropoda) The growth direction of a helicocone shell; commonly referring to growth lines …   Dictionary of invertebrate zoology

  • opisthocyrt — adj. [Gr. opisthen, behind; kyrtos, curved] 1. Arched backward. 2. (MOLLUSCA: Bivalvia) Referring to sloping in a direction posterior from the hinge axis; used to describe hinge teeth or the slope of the shell. 3. (MOLLUSCA: Gastropoda) The… …   Dictionary of invertebrate zoology

  • orthocline — adj. [Gr. orthos, straight; clinein, to lean] (MOLLUSCA) At right angles to the growth direction of the helicocone, especially in oysters; growth lines …   Dictionary of invertebrate zoology

  • prosocline — adj. [Gr. proso, forward; klinein, to slant] 1. (MOLLUSCA: Bivalvia) Hinge teeth or shell sloping anteriorly. 2. (MOLLUSCA: Gastropoda) Usually referring to growth lines leaning forward (adapically) with respect to the direction of the helicocone …   Dictionary of invertebrate zoology

  • prosocyrt — adj. [Gr. proso, forward; kyrtos, curved] (MOLLUSCA: Gastropoda) Used to describe the growth direction of the helicocone curving forward …   Dictionary of invertebrate zoology

  • volution — n. [L. volvere, to roll] (MOLLUSCA: Gastropoda) A complete coil of a helicocone; see whorl …   Dictionary of invertebrate zoology

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