gastropod wikipedia - EAS
Gastropoda - Wikipedia
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 process is unrelated to the coiling of the shell, which is a separate phenomenon. Torsion is present in all gastropods, but the opisthobranch gastropods are secondarily untorted to various degrees.
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Gastropod shell - Wikipedia
The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (semi-slug). Some snails also possess an operculum that seals the opening of t…
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Gastropod - Wicipedia
Gastropoda - Wikipedia, la enciclopedia libre
Gastropoda — Wikipédia
Gastropoda – Wikipédia, a enciclopédia livre
Pila (gastropodo) - Wikipedia, la enciclopedia libre
Rapană - Wikipedia