Bivetiella similis (Sowerby, 1833)
W. Mediterranean to Namibia. Subtidal to continental shelf, in sand, muddy sand and in coralligen, mostly at about 100m deep. The species is said to be « more common in deeper water » (Verhecken 2007; link given further down). Predator.
Original taxon: Cancellaria similis.
Málaga, Andalucia, S. Spain. 32-34mm.
The shell of similis is, as its name suggests, similar to that of cancellata. It differs by « its less-shouldered whorls, and its smoother and less coarse macrosculpture, axial ribs less pronounced, a finer and more elaborate spiral sculpture: between the main spiral cords, second order and third order spirals can be seen on shells in pristine condition; these are lacking on B. cancellata. The spiral bands in B. cancellata are more pronounced than in B. similis. […] The distinction can already be made on the first half teleoconch whorl, where B. similis has 5-7 close-set rugose spirals with no or only very faint axials; while B. cancellata has 4 or 5 distant spirals forming a coarse cancellated pattern with the clearly present axials. » – A. Verhecken: “Revision of the Cancellariidae of the Eastern Atlantic and the Mediterranean”, Zoosystema 29(2), June 2007.

Above, the difference of sculpture and pattern in cancellata (C) and similis (S). Original pictures provided by A. Nappo (IT).
(CC BY-NC-SA)
The species in Th. Löbbecke: “Die Genus Cancellaria”, Syst. Conchylien-Cabinet Bd.4:Abt.4, Nürnberg 1887.
Golden specimens dredged in Dakar area, Sénégal. 22-23mm.

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