''Cryptogemma calypso'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

, a marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk in the family (biology), family Turridae, the turrids.

Description

The (decollate) shell attains a length of 11 mm, its diameter 4.7 mm. (Original description) The shell is small with the protoconch eroded. It is whitish with a dark dull olivaceous periostracum and about five remaining Whorl (mollusc), whorls. The suture is appressed, with a broad smooth ridge in front of it and behind the excavated anal fasciole. The spiral Sculpture (mollusc), sculpture in front of the shoulder consists of fine, even close-set equal threads, covering the surface, including the siphonal canal. The axial sculpture consists of feeble incremental lines arcuate on the fasciole and the antesutural ridge, also of narrow low sigmoid ribs beginning and forming a shoulder in front of the fasciole and obsolete in front of the periphery, differing in strength in different individuals and averaging fourteen on the body whorl. The anal sulcus is wide and deep, rounded The outer Lip (gastropod), lip is thin and sharp and much produced. The inner lip shows a thin layer of callus. The Columella (gastropod), columella is straight, short and obliquely attenuated in front. The axis is impervious. The siphonal canal is distinct, wide and hardly recurved. Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920)

Distribution

This marine species occurs off San Diego, California, USA.

References

External links

* {{DEFAULTSORT:Cryptogemma Calypso Cryptogemma, calypso Gastropods described in 1919