Crassispira premorra

Crassispira premorra is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.[1] It was described by William Healey Dall in 1889.

Crassispira premorra
Illustration of C. premorra by J. C. McConnell.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Pseudomelatomidae
Genus: Crassispira
Species:
C. premorra
Binomial name
Crassispira premorra
(Dall, 1889)
Synonyms.[1]

Drillia premorra Dall, 1889

Description

The length of the shell attains 9.5 mm, its diameter 3.5 mm.

(Original description) The waxen white shell has a vitreous white smooth rounded protoconch of nearly two whorls and eight subsequent sculptured whorls. The spiral sculpture consists of an undulated more or less nodulous narrow band in front of the suture, separated by the fasciole from an angulation, which in the upper whorls is peripheral, and on the body whorl forms a well marked shoulder. In front of this on the upper whorls are one to three, and on the body whorl between the angle and the anterior end of the siphonal canal about a dozen, small sharply elevated threads with much wider interspaces, threads which are, where they intersect the transverse ridges, modified by small sharp nodulations. The transverse sculpture consists of (on the body whorl 14 to 18) sharp-edged low narrow oblique strongly bent ridges rather than ribs, evanescent on the base and fasciole, but corresponding to the elevations on the presutural band. These are proportionally stronger and more prominent near the apex, and become obsolete on the last part of the body whorl. The suture is distinct. The whorls are moderately full. The base of the shell is subconic, slightly constricted for the short siphonal canal. The incremental lines are distinct, stronger on the body whorl. The fasciole is somewhat excavated, smooth except for the curved incremental lines. The surface of the shell is rather vitreous. The aperture of the (not adult) shell is rather wide. The ; wide anal notch is rather shallow. The outer lip is arched. The siphonal canal is hardly differentiated, short, andnarrow. The columella is straight and anteriorly attenuated. [2]

Distribution

It is found in the Gulf of Mexico from Georgia to northwest Cuba, at depths of 183–732 m (600–2,402 ft), in the benthic zone[3]

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References
  1. Rosenberg, G. (2013). Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O (eds.). "Crassispira premorra (Dall, 1889)". MolluscaBase. World Register of Marine Species. Retrieved 11 September 2017.
  2. Dall, W. H. (1889). "Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877–78) and in the Caribbean Sea (1879–80), by the U. S. Coast Survey steamer "Blake," Lieut.-Commander C. D. Sigsbee, U.S.N., and Commander J. R. Bartlett, U.S.N., commanding. XXIX.—Report on the Mollusca. Part II.—Gastropoda and Scaphopoda". Bulletin of the Museum of Comparative Zoölogy. 18: 93–94; Pl. 11, Fig. 18.
  3. Rosenberg, Gary; Moretzsohn, Fabio; García, Emilio F. (2009). "Gastropoda (Mollusca) of the Gulf of Mexico" (PDF). In Felder, David L.; Camp, David K. (eds.). Biodiversity. Gulf of Mexico: Origins, Waters, and Biota. 1. College Station, Texas: Texas A&M Press. p. 664.
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