Description
Author: Jan Delsing
Text ID: 112210
Text Type: 1
Page: 0
Created: 2021-10-29 19:53:26 - User Delsing Jan
Language: EN
Text function: [[t:545270,textblock=112210,elang=EN;Description]]
DISTRIBUTION
Eastern Atlantic (Senegal to Gabon, Cape Verde, the Canary Islands, St. Helena). In the western Atlantic it is only reported from Isla de Aves. Venezuela (Gibson-Smith. 1970). In the Canary Islands it is found in La Palma where it is not rare and there are some reports from Tenerife. In Lanzarote it has been found at least twice, but in both cases it were dead shells.
DESCRIPTION
From 35 to 60 mm. It is a solid species with a pyriform pattern. Shell medium spired of rounded whorls. Sculpture formed with coarse axial costae and flattened spiral cords forming nodules in the intersections, mainly in the upper side of each whorl. There are 2-3 interstitial threads between the cords. Varices very rounded and prominent The last varix departs from the adapical. Siphonal canal straight and medium to long. Aperture oval, narrow with numerous plicae in columellar wall and a double row of teeth in the strong outer lip. The outer ones are bifid. Operculum corneus with a submarginal nucleus. Periostracum green to brownish, cespitous. Protoconch more conical than other species of the genus. 4 smooth whorls of brownish color. Basic color light brown to pale grey yellowish. The aperture and the columella are red with white teeth and plicae. Animal reddish orange.
REMARKS
Saunders, 1980 talks about a report from Poppe from Tenerife. but he has doubts about the presence of this shell in the Canary Islands. Also, Garcfa-Talavera, 1987 talks about fossilized shells in Quaternary deposits, but nothing about living specimens. Later Ricardo Vega Luz reports data of alive specimens in Tenerife at 7 m depth. In the last years there are regular reports from La Palma where it lives in muddy bottoms between 5 and 10 m. In Lanzarote it is an occasional species but it has only been found twice and only as dead shells at 30-40 m in sandy bottoms. For this reason I cannot talk about the establishment of the species in Lanzarote but probably only about the presence of sporadic specimens, carried elsewhere away by currents, that do not find good conditions. In any case the regular captures in La Palma are enough to assume its presence in the Canaries.
Lopez, J., 2007. The family Ranellidae Gray, 1854 in the Canary Islands.