Genus Magnella Dittmer, 1960

Type species: Magnella andersoni Dittmer, 1960, by original designation.

Remarks: This genus resembles Gymnobela in the plump profile, short spire and short anterior siphonal canal. However, according to the original descriptions and type species (Dittmer, 1960; Verrill, 1884), Magnella is characterized by the presence of a strong subsutural spiral cord, whereas in Gymnobela a subsutural cord is not present or it is very faint. Besides, Magnella does not have the strong shoulder that characterizes Gymnobela, and it has a shallower anal sinus. Maxwell (1988) apud Kilburn (1991) proposed that Magnella should be considered a synonym of Mioawateria Vella, 1954 . Like Maxwell, Sysoev (1997) also assumed that the protoconch in the later genus is diagonally cancelled. That assumption can not be confirmed, as the type material of Mioawateria personata (Powell, 1942: 130, pl. 11, fig. 3), the type species of the genus, has a broken protoconch; and in the same paper as the original description of Mioawateria (Vella, 1954: 552) the author placed other species with smooth, blunt protoconchs in this genus. Therefore, there are no objective elements to sustain the synonymy between Magnella and Mioawateria . Besides, M. personata has a much stronger shoulder and a much more delicate subsutural cord, being closer to Gymnobela in general shape.