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The phylogeny (evolutionary "family tree") of molluscs is a controversial subject. In addition to the debates about whether Kimberella and any of the " halwaxiids " were molluscs or closely related to molluscs, [ 5 ] [ 6 ] [ 8 ] [ 9 ] debates arise about the relationships between the classes of living molluscs. [ 7 ]
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 ...
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
Assimineidae is a family of small snails, also known as palmleaf snails, with an operculum, gastropod mollusks or micromollusks in the superfamily Rissoidae. Many of these very small snails live in intermediate habitats, being amphibious between saltwater and land; others live in freshwater.
The Thecosomata (collective/plural: thecosomes, [1] meaning "case/shell-body"), [2] or sea butterflies, are a taxonomic suborder of small, pelagic, free-swimming sea snails known as holoplanktonic opisthobranch gastropod mollusks, in the order Pteropoda (also included within the informal group Opisthobranchia).
Since 2008, the IBM employee-turned-snail farmer has bred snails back on his family farm, where snail production is relatively low maintenance — especially when compared to beef production.
The family Achatinellidae represents a diverse adaptive radiation. All species of tree-snail in Hawaii are believed to have come from a single ancestral snail. How that ancestral snail made the 3,800 kilometres (2,400 mi) trip across the ocean is unknown.
Rhytididae is a taxonomic family of medium-sized predatory air-breathing land snails, carnivorous terrestrial pulmonate gastropod molluscs in the superfamily Rhytidoidea. [1] This family has three subfamilies: Chlamydephorinae Cockerell, 1935 (1903) Rhytidinae Pilsbry, 1893; Corillinae Pilsbry, 1905 [2] A shell of Powelliphanta hochstetteri ...