''Mangelia cryptopleura'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

species of

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

, a marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk in the family Mangeliidae. Julia Anna Gardner, The Molluscan Fauna of the Alum Bluff Group of Florida; UNITED STATES DEPARTMENT OF THE INTERIOR, GEOLOGICAL SURVEY, Professional paper 142 (1947)
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Description

The length of the shell attains 7.1 mm, its diameter 3.1 mm.

Distribution

This extinct marine species was found in the

Alum Bluff Group The Alum Bluff Group is a geologic group in the states of Georgia, Florida, and Alabama. It preserves fossils dating back to the Neogene period. Age Period: Paleogene to Neogene Epoch: Late Oligocene to Early Miocene Faunal stage: Chattian ...

, Florida,

USA The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...

References

cryptopleura Gastropods described in 1947 {{Mangeliidae-stub