REVISION OF THE GENUS NAPAEUS ALBERS, 1850 (GASTROPODA PULMONATA, ENIDAE) - THE PROBLEM OF NAPAEUS (NAPAEINUS) NANODES (SHUTTLEWORTH, 1852) AND DESCRIPTION OF 5 NEW SPECIES FROM ITS CONCHOLOGICAL GROUP

With this paper we initiate a taxonomic review of the genus Napaeus from the Canary Islands, indicating the statistical methodology used therein. We discuss the taxonomic problem of Napaeus (Napaeinus) nanodes (Shuttleworth, 1852), designate its lectotype and describe five new species: Napaeus (Napaeinus) doliolum Henriquez, Napaeus (Napaeinus) bechi Alonso & Ibanez, Napaeus (Napaeus) taguluchensis Henriquez, Napaeus (Napaeus) pygmaeus Ibanez & Alonso and Napaeus (Napaeus) tagamichensis Henriquez, the first two from Tenerife; and the other three from La Gomera. Furthermore, we discuss the general relationships of the genus and its two subgenera, whose original diagnoses are deficient; because of this, we think that in the future a broad review of the subfamily Eninae will be necessary in order to clarify the actual position of this subfamily in the Canary Islands.