Gymnobela agassizii

Gymnobela agassizii
Shell of Gymnobela agassizii (holotype at the Smithsonian Institution)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Raphitomidae
Genus:	Gymnobela
Species:	G. agassizii
Binomial name
Gymnobela agassizii (Verrill & S. Smith [in Verrill], 1880)
Synonyms [1]
Gymnobela agassizi [sic] (misspelling) Gymnobela agassizii permagnaDall, 1890 Pleurotoma agassiziVerrill & S. Smith, 1880 Pleurotoma agassiziiVerrill, 1880 Pleurotoma agassiziiVerrill & S. Smith [in Verrill], 1880 (original combination) Pleurotoma brychiaR. B. Watson, 1881 ( Pleurotomella agassiziVerrill & Smith, 1880 Pleurotomella agassizi permagnaDall, 1890 Pleurotomella brychiaWatson, R.B., 1881 Pleurotomella vitreaVerrill, 1885

Gymnobela agassizii is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. ^[1]

Subspecies: Gymnobela agassizii mexicana(Dall, 1889) (synonym: Pleurotomella agassizii mexicanaDall, 1889)

Description

The length of the shell attains 47 mm, its diameter 14 mm.

The shell is large and handsomely sculptured. It contains eight convex whorls, shouldered, with about sixteen thick, rounded, oblique ribs, separated by concave interspaces. The ribs do not extend above the shoulder, leaving a rather broad flattened band, which is covered by raised revolving lines, more or less decussated by prominent growth lines and slight riblets, running down the suture. The revolving lines become stronger and more elevated below the shoulder, and cross the ribs as well as their intervals. Towards the siphonal canal the ribs fade out and the revolving lines become still more prominent. The outer lip has a wide and rather deep rounded notch below the suture. Below this, it curves strongly forward and recedes again at the siphonal canal, which is rather short, narrowed and a little excurved. The columella is smooth, curved, and obliquely narrowed at the siphonal canal. The aperture is subovate, sinuous and rather large. The shell is white, except the columella which is stained with orange-brown. ^[2]

Distribution

G. agassizii can be found in Atlantic waters, ranging from the coast of Massachusetts south to Tobago. ^[3]

References

1. Gymnobela agassizii (Verrill, 1880) . Retrieved through: World Register of Marine Species  on 29 March 2010.
2. Verrill, A. E. (1880). Notice of the remarkable marine fauna occupying the outer banks off the southern coast of New England. American Journal of Science. 3(20): 390-403
3. Tunnell, John W., Jr., Felder, Darryl L., & Earle, Sylvia A., eds. Gulf of Mexico Origin, Waters, and Biota, Volume 1: Biodiversity. Texas A&M University Press, 2009. 668.

External links

• Verrill A. E. (1885). Third catalogue of mollusca recently added to the fauna of the New England Coast and the adjacent parts of the Atlantic, consisting mostly of deep sea species, with notes on others previously recorded. Transactions of the Connecticut Academy of Arts and Sciences, 6: 395-452, pl. 42-44
• Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295. doi:10.11646/zootaxa.682.1.1.
• Bouchet & Warren, Revision of the North-East Atlantic bathyal and abyssal Turridae (Mollusca, Gastropoda); The Journal of Molluscan Studies, supplement 8, December 1980