Haplocochlias compactus

Haplocochlias compactus
	Drawing with an apertural view of a shell of Haplocochlias compactus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Skeneidae
Genus:	Haplocochlias
Species:	H. compactus
Binomial name
	Haplocochlias compactus; (Dall, 1889)
Synonyms
	Fossarus (Gottoina) compacta Dall, 1889

Haplocochlias compactus is a species of sea snail, a marine gastropod mollusc in the family Skeneidae.^[1]

Description

(Original description by W.H. Dall) The height of the shell attains 2.3 mm, its diameter 2 mm. The small, white shell is compact and elevated. It is spirally sculptured with about 4½ whorls, including the nucleus. The outline of the spire is convex with hardly any rounding in of the whorls toward the suture, which is nevertheless distinct and finely channelled. There is no radiating sculpture. The lines of growth are not visible. The spiral sculpture consists of fine, close, even, rounded threads, growing gradually smaller from the suture forward. There is no secondary grooving. There are about 25 threads on the body whorl, but they vary in number and strength with the individual specimen. The imperforate base of the shell is full and rounded. The aperture is rounded, pointed behind, and the angle is filled with callus. This callus is continuous and is the thinnest on the columella.^[2]

Distribution

This species occurs in the Gulf of Mexico and in the Caribbean Sea; in the Atlantic Ocean off North Carolina, USA.

References

^ Gofas, S. (2013). Haplocochlias compactus (Dall, 1889). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=737541 on 2013-10-21
^ Dall W. H. 1889. Reports on the results of dredging, 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 2, Gastropoda and Scaphopoda. Bulletin of the Museum of Comparative Zoölogy at Harvard College 18: 1–492, pls. 10–40 (described as Fossarus (Gottoina) compacta

[WoRMS-1] Gofas, S. (2013). Haplocochlias compactus (Dall, 1889). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=737541 on 2013-10-21

[2] Dall W. H. 1889. Reports on the results of dredging, 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 2, Gastropoda and Scaphopoda. Bulletin of the Museum of Comparative Zoölogy at Harvard College 18: 1–492, pls. 10–40 (described as Fossarus (Gottoina) compacta

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