Découverte du matériel type de Niso eburnea Risso, 1826, espèce type du genre Niso Risso, 1826 (Mollusca, Gastropoda, Eulimidae) et implications taxonomiques

In 1826, Risso erected Niso eburnea, a gastropod species from Zanclean (Lower Pliocene) of La Trinite, Nice (Alpes-Maritimes, France), and designated it as type species of his new genus Niso. Considering the often inaccurate information on the type species of the genus Niso Risso, 1826 we give here a description and figures of this species. Moreover, the type material of Niso eburnea Risso, 1826, from Risso’s collection, considered as lost, have recently been discovered in the Collection de Paleontologie of the Museum national d’Histoire naturelle, Paris. A lectotype is herein designated to fix the status of this species.