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. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. Gastropods that naturally lack a shell, or have only an internal shell, are mostly called slugs, and land snails that have only a very small shell are often called semi-slugs.
A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. Land snail is the common name for terrestrial gastropod mollusks that have shells. However, it is not always easy to say which species are terrestrial, because some are more or less amphibious between land and fresh water, and others are relatively amphibious between land and salt water.
Euglandina is a genus of predatory medium- to large-sized, air-breathing, land snails, terrestrial pulmonate gastropod mollusks in the family Spiraxidae.
The Littorinidae are a taxonomic family of over 200 species of sea snails, marine gastropod molluscs in the clade Littorinimorpha, commonly known as periwinkles and found worldwide.
Urocoptidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea.
Vertigo gouldii, common name the variable vertigo, is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.
Holospira is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Urocoptidae.
Holospira elizabethae is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Urocoptidae.
Holospira pasonis, common name robust holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira bilamellata, common name bilamellate holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira arizonensis, common name the Arizona holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira danielsi, common name strongrib holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira mesolia, common name widemouth holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira goldfussi, common name the New Braunfels holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira yucatanensis, common name Bartsch holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira riograndensis, common name the Rio Grande holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira pityis, common name pinecone holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira oritis, common name mountain holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Holospira montivaga, common name the vagabond holospira, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Urocoptidae.
Spartocentrum is a genus of air-breathing land snails, a terrestrial pulmonate gastropod mollusks in the subfamily Bulimulinae of the family Bulimulidae.
