Williams, Suzanne T. Department of Zoology, Natural History Museum, London, United Kingdom.
- Biology of extant species
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A large marine clade of evolutionarily ancient gastropods. Vetigastropoda was originally established as a suborder of the molluscan order Archaeogastropoda. However, members of the Archaeogastropoda are not monophyletic (that is, a group including the most recent common ancestor of its component members and all its descendants), and thus this name is no longer used in formal molluscan systematics. The order was broken up into three large unranked groups, Patellogastropoda (true limpets), Vetigastropoda (an entirely marine clade), and Neritimorpha (a clade that includes marine, freshwater, and terrestrial species), and two smaller clades, Cocculinoidea (deep-water “limpets”) and Neomphalina (hot-vent taxa). The relationships among these groups are not well resolved. See also: Gastropoda; Mollusca; Neritimorpha; Prosobranchia
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