n. [Gr. chiasma, cross; neuron, nerve]
In prosobranchs and a few other taxa, a condition in which the visceral loop is distinctively twisted; crossing of the visceral connectives; streptoneury; chiastoneural a; see orthneury, euthyneury.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • streptoneury — n. [Gr. strepsis, twisting; neuron, nerve] (MOLLUSCA: Gastropoda) Equivalent to chiastoneury …   Dictionary of invertebrate zoology

  • torsion — n. [L. torquere, to twist] 1. Spiral bending; twisting. 2. (MOLLUSCA: Gastropoda) The theory in ancestral gastropods that a 180 degree counterclockwise twisting occurred that caused the crossing of the pleural visceral connectives in the nervous… …   Dictionary of invertebrate zoology

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