The main feature of Gastropods is torsion. At some stage in their development part of the body containing the internal organs rotates through 90 to 180 degrees relative to the foot. Typically they have a large muscular creeping foot which they can retract into a coiled shell and often close the opening with a lid, the operculum. The head has one or two pairs of tentacles, eyes and a rasping tongue, the radula. The Pulmonates include snails and slugs, the latter having lost their shells, which live on land and can breathe air. The Nudibranchs include the sea slugs and sea hares in which the shells have largely been lost or become internal. The Prosobranchs include other aquatic species with a single shell such as the top shell, periwinkle, cowrie and whelk.
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Hardy's Internet Guide to Marine Gastropods
A virtual encyclopedia of sea snails. The catalog is organized taxonomically, and contains pictures, common and scientific names, and basic taxonomic information for a large number of species.
Overview of gastropod classification from the Animal Diversity Web.
Freshwater Snails Of Florida
Contains an online version of The Freshwater Snails of Florida, a manual for identification, prepared by Fred G. Thompson.
Photomicrograph of a developing larva with a transparent shell.
Information from Wikipedia on these univalve snails, including their distribution, habitat, description, geological history and complex classification.
Information on gastropods from an aquarist's viewpoint. Includes pages on specific orders of gastropods, as well as a general gastropod FAQ.
Marine Snails and Pteropods
Photographic study by Jean-Marie Cavanihac of these marine organisms, with photographs of a typical rasping radula and some animated sequences.
NMITA Gastropod Taxonomic List
The list provides a current systematic framework and summary of the taxonomic diversity of Panama Paleontology Project (PPP) mollusc collections collected, curated and identified from project inception till October 2000.
Rockers and Wallers
A look at the attractive smaller landshells that live on walls and in rocky habitats, with photographs of many species found in Austria.
Last update:February 12, 2017 at 19:22:17 UTC