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The shell of Stenotrema florida, a land snail or terrestrial gastropod.The periostracum of this species has minute hairs, giving the snail a velvety feel A yellowish tan periostracum is visible on the lower two thirds of this juvenile (8 cm) valve of the marine bivalve Spisula solidissima The dark periostracum is flaking off of this dried-out valve of the "ocean quahog", marine bivalve Arctica ...
In some gastropods, the aperture is narrowed by protruding plaits, which help make the soft parts of the animal less vulnerable to predation. The growth of the shell is provided for by non-continuous addition of minute layers to the aperture margin (also called peristome) from the mantle border, the principal agent in the secretion of the shell.
Gastropod – any member of the class Gastropoda, which includes slugs and snails. What type of things are gastropods? Gastropods can be considered to be, or viewed ...
By moving the mantle cavity over the head, the gastropod can retract its vulnerable head into its shell. Some gastropods can also close the entrance to their shell with a tough operculum, a door-like structure which is attached to the dorsal surface of their foot. In evolutionary terms, the appearance of an operculum occurred shortly after that ...
Gastropod stubs (6 C, 121 P) Pages in category "Gastropods" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. ...
Pages in category "Cretaceous gastropods" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. C. Condonella; H.