Magnella Dittmer, 1960
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https://doi.org/ 10.5281/zenodo.210977 |
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https://doi.org/10.5281/zenodo.5632963 |
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https://treatment.plazi.org/id/8E7187D8-8E33-674A-47C0-E437FC466942 |
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Plazi |
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Magnella Dittmer, 1960 |
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Genus Magnella Dittmer, 1960 View in CoL
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.
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