Aforia circinata

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

Aforia circinata
Shell of Aforia circinata (holotype at the Smithsonian Institution)
Scientific classification
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 chosenensis Bartsch, 1945
  • Aforia diomedea Bartsch, P., 1945
  • Aforia hondoana (Dall, 1925)
  • Aforia insignis (Jeffreys, 1883)
  • Aforia japonica Bartsch, 1945
  • Aforia okhotskensis Bartsch, P., 1945
  • Aforia sakhalinensis Bartsch, P., 1945
  • Daphnella circinata Dall, 1873
  • Mangilia (Aforia) circinata (Dall, 1873)
  • Pleurotoma circinata Dall, 1873 (original combination)
  • Pleurotoma insignis Jeffreys, 1883
  • Surcula hondoana Dall, W.H., 1925
  • Turricula hondoana Dall, 1925
  • Turris (Aforia) circinata Dall, 1873

Description

The shell grows to a length of 75 mm. The slender, elongate shell is covered with a brownish epidermis. There are six evenly rounded whorls, but with a sharp carina, above which they are smooth, whilst below it they are grooved, with wider interspaces. The anal sinus is deep, about one-third of the way from the carina to the suture.[3]

(Original description) The shell is slender, elongate and covered with a brownish epidermis. It contains six whorls , with a single, sharp, narrow carina, about the middle of the whorl in the upper whorls. This carina does not interrupt the even rotundity of the whorls so as to produce any flattening of the latter, but appears as if it had been placed upon the equator of the whorl, after the latter had been completed. The posterior surface of the carina and that part of the whorls behind it, are destitute of any but the most microscopic revolving striae, though plainly marked by the deeply notched lines of growth. The anterior surface of carina and whorls is covered with sharp, revolving grooves, with wider interspaces, being about twelve on the body whorl, between the posterior edge of the aperture and the carina. The notch is deep, and about one-third of the way from the carina to the suture. The aperture and the siphonal canal are long and narrow. The outer lip, before the carina, is effuse. 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)
  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)
  • 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]
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