Afrivoluta pringlei: Difference between revisions
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==Shell description== |
==Shell description== |
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The columellar [[plait (gastropod)|plait]]s, four in number, are extraordinarily prominent and massive; the whole shell is shiny and polished, with a large, very prominent reddish [[parietal callus|callus]] on the [[body whorl]] immediatly below the suture and above the [[aperture (mollusc)|aperture]], and extending for some distance down beside the aperture. The shell has a superficial spiral [[sculpture (mollusc)|sculpture]], the spirals being broad and further apart on the body whorl below the suture for about one-fifth of its lengh, but gradualy becoming fine and almost microscopic. |
The columellar [[plait (gastropod)|plait]]s, four in number, are extraordinarily prominent and massive; the whole shell is shiny and polished, with a large, very prominent reddish [[parietal callus|callus]] on the [[body whorl]] immediatly below the [[suture (gastropod)|suture]] and above the [[aperture (mollusc)|aperture]], and extending for some distance down beside the aperture. The shell has a superficial spiral [[sculpture (mollusc)|sculpture]], the spirals being broad and further apart on the body whorl below the suture for about one-fifth of its lengh, but gradualy becoming fine and almost microscopic. |
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Tomlin called the genus ''Afrivoluta'', and the genotype ''pringlei'', after the Director of the Port Elizabeth Museum and Snake Park. |
Tomlin called the genus ''Afrivoluta'', and the genotype ''pringlei'', after the Director of the Port Elizabeth Museum and Snake Park. |
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Revision as of 18:21, 3 November 2007
| Afrivoluta pringlei | |
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| Afrivoluta pringlei trawled off Cape Agulhas, South Africa | |
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| Species: | A. pringlei
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| Binomial name | |
| Afrivoluta pringlei Tomlin, 1947
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Afrivoluta pringlei is a large deepwater sea snail with a glossy shell, a marine gastropod mollusc in the family Marginellidae, the marginellids.
This species is endemic to South Africa, and it is found south-east of Cape Recife in 220 m. Specimens have been found off Algoa Bay and Jeffreys Bay.
Trawling in deep water in the Algoa Bay area of South Africa has produced some interesting new species of mollusca. The splendid shell which Tomlin described as the most striking form discovered in South African waters since Neptuniopsis, turned up off the Cape almost two centuries previously.
Shell description
The columellar plaits, four in number, are extraordinarily prominent and massive; the whole shell is shiny and polished, with a large, very prominent reddish callus on the body whorl immediatly below the suture and above the aperture, and extending for some distance down beside the aperture. The shell has a superficial spiral sculpture, the spirals being broad and further apart on the body whorl below the suture for about one-fifth of its lengh, but gradualy becoming fine and almost microscopic.
Tomlin called the genus Afrivoluta, and the genotype pringlei, after the Director of the Port Elizabeth Museum and Snake Park.
The original description of the species, by Tomlin, 1947
Afrivoluta pringlei new genus and species
Shell large, elongate, with blunt rather swollen apex, whorls five; there are five close lines of growth, and very faint, irregular, superficial spirals on the body whorl which become almost microscopic on the lower three-quarters of the shell; colour chestnut-brown with two lighter brood bands of pale reddish brown in the middle of the body whorl and a narrow whitish sutural edging; collumellar plaits red; interior a rusty reddish brown. At the top of the body whorl immediatly below the suture a large prominent rounded reddish callus, measuring about an inch in diameter, descends from the suture past the apex of the aperture. The columella projects somewhat below the base of the aperture; peristome thickened.
The shell length is up to 4½ inches, and the diameter is slightly over 1½ inches. The length of the aperture is up to 3 inches, with an aperture breadth of 9/16 inch.
References
- Lipe, R. 1991. Marginellas:37;pl.18, fig 1
- Lorenz 1993. World Shells 4:49
- Tomlin, John Reed le Brockton 1947. Journal of Conchology 22(10):244-246