7/18/2023 0 Comments Average speed of a snail![]() ![]() ![]() ![]() ![]() The largest clade of land snails is the Cyclophoroidea, with more than 7,000 species. Most of the non-pulmonate land snails belong to lineages in the Caenogastropoda, and tend to have a gill and an operculum. The majority of land snails are pulmonates that have a lung and breathe air. Land snails are a polyphyletic group comprising at least ten independent evolutionary transitions to terrestrial life (the last common ancestor of all gastropods was marine). 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. Land snail is the common name for terrestrial gastropod mollusks that have shells (those without shells are known as 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. ![]()
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