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A snail is a shelled gastropod. The name is most often applied to land snails , terrestrial pulmonate gastropod molluscs . However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into.
Reticulated – Resembling a network, as when the longitudinal and spiral lines cross in a snail. [1] Retractile – Capable of being drawn in, as the eye peduncles in land snails. [1] Retractor pedis – Foot retractor muscle. [1] Revolving lines – Spiral lines on a snail shell which run parallel with the sutures. [1]
They did not spend a long time on shore because of a revolution, but Swainson returned to England in 1818 in his words "a bee loaded with honey", with a collection of over 20,000 insects, 1,200 species of plants, drawings of 120 species of fish, and about 760 bird skins.
Gyraulus parvus is a species of freshwater snail in the family Planorbidae, the ram's horn snails.It is known by the common name ash gyro. [1] [4] [5] It is native to much of North America and the Caribbean, where it occurs in Canada, the United States, Mexico, Hispaniola, Jamaica, Cuba, and Puerto Rico.
Stomatella varia (A. Adams, 1850) (dubious synonym) Stomatella auricula , common name the false ear shell , is a species of sea snail , a marine gastropod mollusk in the family Trochidae , the top snails.
Synonyms Helix alliaria Miller, 1822 Oxychilus alliarius , commonly known as the garlic snail or garlic glass-snail , is a species of small, air-breathing land snail , a terrestrial pulmonate gastropod mollusk in the glass snail family, Oxychilidae .
Lymnaea bulimoides Lea, 1841: synonym of Sphaerogalba bulimoides (Lea, 1841) Lymnaea bulla Kobelt, 1881: synonym of Cerasina bulla (Kobelt, 1881) Lymnaea cailliaudi (Bourguignat, 1883): synonym of Radix natalensis (F. Krauss, 1848) (junior synonym) Lymnaea catascopium Say, 1817: synonym of Ladislavella catascopium (Say, 1817)
The anatomy of a common air-breathing land snail: much of this anatomy does not apply to gastropods in other clades or groups. Snails are distinguished by an anatomical process known as torsion, where the visceral mass of the animal rotates 180° to one side during development, such that the anus is situated more or less above the head. This ...