New taxonomical and biological observations on Jujubinus seguenzae Ghisotti et Melone, 1975 (Gastropoda Vetigastropoda Trochidae)

摘要

The study of numerous shells in the collection of the Authors and the finding of new material,among which a single living specimen, some kilometers South to the known geographicalarea of distribution, allowed us a better accurate morphological study of the shell, the protoconchshape and sculpture and the anatomy and color pattern of the external soft parts. Thusnew data allowed to enlarge its geographical distribution and the current taxonomical statusof the species. Comparisons with shell and soft parts of similar congeners are made. In particular,differences between Jujubinus seguenzae Ghisotti et Melone, 1975 and the main“morphs” of J. striatus (Linnaeus, 1758) (Gastropoda Vetigastropoda Trochidae) will be underlinedand the possibility that this last taxon would be better re-defined on the basis of theoriginal materials is discussed.