Three new species and a new subgenus of Gulella (Gastropoda: Streptaxidae) from Tanzania

Three small species of Gulella from forests in northem Tanzania are described as new species. One of the new species, Gulella spinosa, is the first Gulella or member of the family Streptaxidae which has been reported with a spiny shell.

The new species share several conchological characters which have not been reported elsewhere in the genus Gulella and they are assigned to a new subgenus, Juventigulella. The main characters defining Juventigulella are the conical or conical-ovate shell shape, detached aperture and open umbilicus. The subgeneric name refers to the superficially juvenile appearance of adult specimens. Gulella habibui is designated as the type species.