''Turris carlsoni'' is an extinct 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

Turridae Turridae is a taxonomic family name for a number of predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. MolluscaBase (2018). Turridae H. Adams & A. Adams, 1853 (1838). Accessed through: World Register of Marine Specie ...

, the turrids.

Description

The length of the figured specimen, (apex and siphonal canal defective) is 43 mm. ; the width of the body whorl, 24 mm. (Original description) The large and solid shell has a fusiform shape. It contains about eight

whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane flo ...

s. The spire is high, with an acute apex. The whorls of the spire show a subdued angular appearance below the middle. They are slightly concave above and convex below. They are ornamented with a row of nodes on the angulation, and numerous spiral striations somewhat alternating in prominence. The suture is appressed, bordered by a sutural collar. The

body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ...

is ventricose, convex near the middle of the whorl, with inconspicuous or obsolete nodes, spiral sculpture the same as on the upper whorls. On some specimens the lower portion of the body whorl is marked by raised spiral cords and intercalary lines in place of the incised lines or striations. The aperture is oval, with a simple outer lip. The columella is incrusted, smooth, with an anterior sulcus. The siphonal canal is moderately long and is curved to the left. Anderson, Frank Marion - Martin, Bruce - Neocene record in the Temblor Basin, California, and Neocene deposits of the San Juan District, San Luis Obispo County: Proceedings of the California Academy of Sciences Volume: 4, 1914
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Description

Distribution

References

External links