Customize your Medscape account with the health plans you accept, so that the information you need is saved and ready every time you look up a drug on our site or in the Medscape app. Easily compare tier status for drugs in the same class when considering an alternative drug for your patient.
The carnivorous snails have tongues that are covered with thousands of tiny teeth to tear apart food. The gastropod fossils from Jacksboro, TX shown below are from the Pennsylvanian, Finis formation, and these gastropods lived about 300 million years ago.
1 Gastropods (Gastropoda) - There are between 60,000 and 80,000 species of gastropods alive today. 2  Gastropods are the most diverse of the mollusk groups. 3  Members of this group include limpets, top shells, periwinkles, sundial shells, sea hares, nudibranchs, snails and slugs.ollusks are classified within the following taxonomic hierarchy: Animals Invertebrates. Mollusks are divided into the following taxonomic groups: 1  Caudofoveates and solanogastrates (Aplacophorans) - There are about 70 species of caudofoveates and 250 species of solanogastrates alive today.