mollusk gastropod http://id.loc.gov/authorities/subjects/sh85053446 http://purl.bioontology.org/ontology/MESH/D049851 http://purl.bioontology.org/ontology/NCBITAXON/6448 http://purl.bioontology.org/ontology/SNOMEDCT/106878004 https://en.wikipedia.org/wiki/Category:Gastropods https://en.wikipedia.org/wiki/Gastropoda https://www.wikidata.org/wiki/Q4867740 Angiogastropoda Any members of the class comprising snails and slugs from saltwater, from freshwater, and from the land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. As of 2017, 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Apogastropoda Gasteropoda Gastropoda QL430.4-QL430.5 SB998.G37 Psilogastropoda gastropods snails and slugs univalve