Aforia circinata

Aforia circinata
Shell of Aforia circinata (holotype at the Smithsonian Institution)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Cochlespiridae
Genus:	Aforia
Species:	A. circinata
Binomial name
Aforia circinata (Dall, 1873)
Synonyms [1]
Aforia chosenensisBartsch, 1945 Aforia diomedeaBartsch, P., 1945 Aforia hondoana(Dall, 1925) Aforia insignis(Jeffreys, 1883) Aforia japonicaBartsch, 1945 Aforia okhotskensisBartsch, P., 1945 Aforia sakhalinensisBartsch, P., 1945 Daphnella circinataDall, 1873 Leucosyrinx circinata(Dall, 1873) · Mangilia (Aforia) circinata(Dall, 1873) Pleurotoma circinataDall, 1873 (original combination) Pleurotoma insignisJeffreys, 1883 Surcula hondoanaDall, W.H., 1925 Turricula hondoanaDall, 1925 Turricula japonicaDall, 1925 Turris (Aforia) circinataDall, 1873

Aforia circinata, common name the ridged turrid, is a species of sea snail, a marine gastropod mollusk in the family Cochlespiridae. ^{[1] [2]}

Description

The shell grows to a length of 75 mm.

The slender, elongated shell is coated with a brownish epidermis. It features six evenly rounded whorls, characterized by a sharp carina. Above the carina, the shell is smooth, while below it, the surface is grooved with wider interspaces. The deep anal sinus is situated approximately one-third of the way from the carina to the suture. ^[3]

(Original description) The shell is slender and elongated, covered with a brownish epidermis. It features six whorls with a single, sharp, narrow carina located around the middle of the upper whorls. This carina does not disrupt the even roundness of the whorls but appears as if it were placed on the equator of the whorl after its formation. The posterior surface of the carina and the area behind it are nearly smooth, marked only by microscopic revolving striae and deeply notched growth lines. In contrast, the anterior surface of the carina and whorls is adorned with sharp, revolving grooves and wider interspaces, numbering about twelve on the body whorl between the posterior edge of the aperture and the carina. The deep notch is positioned about one-third of the way from the carina to the suture. The aperture and siphonal canal are long and narrow, with the outer lip effuse before the carina. The nucleus is white. ^[4]

Distribution

This marine species occurs in the Bering Sea and in cold waters from Alaska to Japan

References

1. Aforia circinata (Dall, 1873) . Retrieved through: World Register of Marine Species  on 29 August 2011.
2. P. Bouchet; Yu. I. Kantor; A. Sysoev; N. Puillandre (2011). "A new operational classification of the Conoidea (Gastropoda)". Journal of Molluscan Studies . 77 (3): 273–308. doi: 10.1093/mollus/eyr017 .
3. George Washington Tryon, Manual of Conchology vol. VI p. 316; 1884 (described as Daphnella circinata) This article incorporates text from this source, which is in the public domain .
4. W.H. Dall, Descriptions of new Species from the Coast of Alaska with notes of some rare forms; Proceedings of the California Academy of Sciences ser. 1 vol. 5 p. 61 (1873) This article incorporates text from this source, which is in the public domain .

• Hasegawa K. (2009) Upper bathyal gastropods of the Pacific coast of northern Honshu, Japan, chiefly collected by R/V Wakataka-maru. In: T. Fujita (ed.), Deep-sea fauna and pollutants off Pacific coast of northern Japan. National Museum of Nature and Science Monographs 39: 225–383.
• Hasegawa K. & Okutani T. (2011) A review of bathyal shell-bearing gastropods in Sagami Bay. Memoirs of the National Sciences Museum, Tokyo 47: 97–144. [15 April 2011]

External links

• "Aforia circinata". Gastropods.com. Retrieved 29 August 2011.
• Aurivillius, C.W.S. 1885. Öfversigt öfver de af Vega-Expeditionen insamlade arktiska Hafmollusker. II. Placophora och Gastropoda. In: Nordenskiöld, A.E. (Ed.) Vega-Expedionens Vetenskapliga Iakttagelser, 4: 313–383, pls. 12-13