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4 – columella 5 – suture 6 – body whorl 7 – apex Four views of a shell of Arianta arbustorum: Apertural view (top left), lateral view (top right), apical view (bottom left), and umbilical view (bottom right). The gastropod shell is part of the body of many gastropods, including snails, a kind of mollusc.
This list of gastropods described in 2018 is a list of new taxa of snails and slugs of every kind that have been described (following the rules of the ICZN) during the year 2018. The list only includes taxa at the rank of genus or species .
The central shell clearly shows the selenizone as a series of holes A selenizone (from the Greek "selene" meaning "moon", and "zone" meaning " girdle ") is an anatomical structure that exists in the shells of some families of living sea snails : the slit shells , the little slit shells and the abalone , which are marine gastropod mollusks from ...
Miocene Gastropods and Biostratigraphy of the Kern River Area, California; United States Geological Survey Professional Paper 642 This article incorporates text from this source, which is in the public domain. Houbrick, Richard S. "Phylogenetic relationships and generic review of the Bittiinae (Prosobranchia: Cerithioidea)." Malacologia (1993).
Siphonal indentations have evolved multiple times in gastropods and are widespread among many clades. Euomphanilae gastropods in the genus Scalites developed siphons in the early Ordovician period (448-443 MYA); however, they are not observed in any other members of the clade. 22 of an estimated >23 instances of siphonal indentations evolved in Murchosinoniinae gastropods - the two major ...
In very large gastropods such as the queen conch (Aliger gigas) once the columellar muscles are cut with a knife, the soft parts of the animal fall out of the shell easily. Conch fishermen in the Caribbean Sea break a small hole in the spire of the shell, cut the columellar muscles, and harvest the live meat of this species. Often the fishermen ...
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
Living abalone in tank showing epipodium and tentacles, anterior end to the right. Abalone (/ ˈ æ b ə l oʊ n i / ⓘ or / ˌ æ b ə ˈ l oʊ n i /; via Spanish abulón, from Rumsen aulón) is a common name for any small to very large marine gastropod mollusc in the family Haliotidae, which once contained six genera but now contains only one genus, Haliotis. [1]