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Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
Most of the non-pulmonate land snails belong to lineages in the Caenogastropoda, and tend to have a gill and an operculum. The largest clade of land snails is the Cyclophoroidea, with more than 7,000 species. [6] Many of these operculate land snails live in habitats or microhabitats that are sometimes (or often) damp or wet, such as in moss.
The Aciculidae are a family of small land snails that have opercula (an operculum is a little door that closes the shell when the animal retracts into it). In other words, Aciculidae are terrestrial operculate gastropods.
This group includes land snails and land slugs. Loss of the shell has taken place many times in different groups that are not evolutionarily closely related, and land snails and slugs are most often treated together as a single group in specialized malacological literature. [2] [3] All terrestrial molluscs belong to the class Gastropoda.
The family Pomatiidae is a taxonomic family of small operculate land snails, terrestrial gastropod mollusks that can be found over the warmer parts of the Old World. In the older literature, this family is designated as Pomatiasidae. This family is a lineage closely related to the Littorinidae (periwinkles) common in coastal habitat. They have ...
Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the order Architaenioglossa belonging to the subclass Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
The family Annulariidae is a taxonomic family of small operculate land snails in the superfamily Littorinoidea. [1] Genera. Subfamily Abbottellinae Watters, 2016.
Alcadia nuda is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae. [1] Subspecies. Alcadia nuda bagaensis Aguayo, 1953; Alcadia nuda nuda (L. Pfeiffer, 1866)