Profil taxonu
Obrázky
Autor: Verduin, A.
Možné záměny
R. decorata is very similar to R. guerinii, and mainly differs in:
— the low number of terminal ribs per whorl, rarely more than 9,
— the high number of ribbed whorls, rarely less than 4,
— the brilliant colours of the shells,
— the brownish colour of the uppermost whorls of the normal colour variety.
— the smaller dimensions of the apex
As far as is known at the moment, the ranges of R. decorata and R. guerinii do not overlap. Because each species is quite constant in its entire area, because they are quite sharply delimited from each other as regards a number of characters, and because both probably have a pelagic larval phase and cannot be considered geographically isolated, I feel that they may best be considered distinct species rather than subspecies or even varieties.
Some shells of R. decorata (e.g. two shells from Punta Mica, Vrd. 0081) agree rather satisfactorily with the original diagnosis and figures of R. frauenfeldiana Brusina, 1866. Therefore, I believe the latter to be a variety of R. decorata .
— the low number of terminal ribs per whorl, rarely more than 9,
— the high number of ribbed whorls, rarely less than 4,
— the brilliant colours of the shells,
— the brownish colour of the uppermost whorls of the normal colour variety.
— the smaller dimensions of the apex
As far as is known at the moment, the ranges of R. decorata and R. guerinii do not overlap. Because each species is quite constant in its entire area, because they are quite sharply delimited from each other as regards a number of characters, and because both probably have a pelagic larval phase and cannot be considered geographically isolated, I feel that they may best be considered distinct species rather than subspecies or even varieties.
Some shells of R. decorata (e.g. two shells from Punta Mica, Vrd. 0081) agree rather satisfactorily with the original diagnosis and figures of R. frauenfeldiana Brusina, 1866. Therefore, I believe the latter to be a variety of R. decorata .
Verduin, A. (1985). On the taxonomy and variability of recent European and North African species of the subgenera Apicularia and Goniostoma of the genus Rissoa (Gastropoda, Prosobranchia).
Rozšíření
R. decorata is washed ashore rather numerously in the Adriatic Sea.
Verduin, A. (1985). On the taxonomy and variability of recent European and North African species of the subgenera Apicularia and Goniostoma of the genus Rissoa (Gastropoda, Prosobranchia).
Autor: Jan Delsing
Možné záměny
Odkazy a literatura
Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Rissoa decorata Philippi, 1846]Datum citace: 23. listopad 2013
Repetto G., Orlando F. & Arduino G. (2005): Conchiglie del Mediterraneo, Amici del Museo "Federico Eusebio", Alba, Italy [jako Rissoa decorata Philippi, 1846]
Tarruella Ruestes, A. (2002): Moluscos marinos de Cap Ras y Llançà (Girona, NE de la península Ibérica), Spira, 1(2): 1-14 [jako Rissoa decorata Philippi, 1846]