- parietal callus
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(MOLLUSCA: Gastropoda)A thickening of the inner lip.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
parietal callus
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Parietal callus — A parietal callus is a feature that can be found on the shell of a some snails, especially certain sea snails, marine gastropod mollusks.This callus is a thickened calcareous deposit on the inner wall of the aperture of the gastropod shell, the… … Wikipedia
callus — n.; pl. calluses, calli [L. callus, hard skin] 1. An unusually hardened or thickened area; a rounded swelling. 2. (ARTHROPODA: Insecta) In brachycerous Diptera, a knoblike swelling on the cuticle. 3. (MOLLUSCA: Gastropoda) A shelly substance… … Dictionary of invertebrate zoology
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Gastropod shell — [ 1 umbilicus2 parietal callus3 aperture4 columella5 suture6 whorl7 apex] The gastropod shell is a shell which is part of the body of a gastropod or snail. It is an external skeleton or exoskeleton, which serves not only for muscle attachment,… … Wikipedia
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