Hadroconus watsoni

Hadroconus watsoni
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Vetigastropoda
Superfamily:	Seguenzioidea
Family:	Seguenziidae
Subfamily:	Seguenziinae
Genus:	Hadroconus
Species:	H. watsoni
Binomial name
	Hadroconus watsoni; (Dall, 1927)
Synonyms[1]
	Basilmissa superba Watson, 1889 (young specimen) [2]; Basilissa watsoni Dall, 1927 (original description);

Hadroconus watsoni is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.[1]

Description

(Original description by W.H. Dall) The height of the shell attains 5 mm. The small, white shell has a flatly conical shape, with a glassy minute nucleus of one whorl and seven subsequent whorls. The suture is closely appressed, not impressed. The whorls above the base are flat. The axial sculpture consists of many protractively flexuous extremely fine lines with wider interspaces over all the whorls. The cemented edges at the suture by their opacity look like a presutural band, but this is not reflected in the sculpture. The spiral sculpture on the spire consists of almost microscopic close striae. On the base there are about a dozen fine spiral grooves between the edge of the umbilicus and the periphery, a little coarser near the carina. The base of the shell is nearly flat, and sharply carinate at the periphery. The umbilicus is funicular, deep, the verge carinate. The aperture is quadrate, slightly oblique. Its margin is thin, sharp, and simple.[3]

Distribution

This species occurs in the Atlantic Ocean off the coast of Georgia, USA.

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References

Rosenberg, G. (2013). Hadroconus watsoni (Dall, 1927). Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492409 on 2013-06-10
Dall, Mus. Comp. Zool., vol. 18, p. 384, 1889.
Dall W. H. (1927). Small shells from dredgings off the southeast coast of the United states by the United States Fisheries Steamer "Albatross", in 1885 and 1886; Proceedings of the United States National Museum, 70(18): 1-134 Archived 2013-06-16 at the Wayback Machine (described as Basilissa watsoni)

External links

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[WoRMS-1] Rosenberg, G. (2013). Hadroconus watsoni (Dall, 1927). Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492409 on 2013-06-10

[2] Dall, Mus. Comp. Zool., vol. 18, p. 384, 1889.

[3] Dall W. H. (1927). Small shells from dredgings off the southeast coast of the United states by the United States Fisheries Steamer "Albatross", in 1885 and 1886; Proceedings of the United States National Museum, 70(18): 1-134 Archived 2013-06-16 at the Wayback Machine (described as Basilissa watsoni)