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Aperture (gastropod)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for '' Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a '' gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norelona Pyrenaica Shell
''Norelona '' is a monospecific genus of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Elonidae. MolluscaBase eds. (2021). MolluscaBase. Norelona H. Nordsieck, 1986. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=996224 on 2021-10-03 Species * ''Norelona pyrenaica ''Norelona pyrenaica'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Elonidae. ''Norelona pyrenaica'' is the type species of the genus '' Norelona''. Shell description The shell is narrowl ...'' (Draparnaud, 1805) References * Nordsieck, H. (1986). Das System der tertiären Helicoidea Mittel- und Westeuropas (Gastropoda: Stylommatophora). Heldia. 1(4): 109-120. * Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. {{taxonbar, from=Q18591393 Elonidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
