Unraveling the conoidean gastropods assigned to the genus Propebela (Gastropoda: Mangeliidae) from Southwestern Atlantic deep waters

SÁNCHEZ, NOELIA CAROLINA; DAMBORENEA, CRISTINA; PASTORINO, GUIDO

JOURNAL OF NATURAL HISTORY

TAYLOR & FRANCIS LTD

Lugar: Londres; Año: 2023 vol. 57 p. 243 - 256

0022-2933

A new genus of conoidean gastropods of the family Mangeliidae, Notopropebela n. gen., is herein described to include N. profunda (Castellanos & Landoni, 1993) previously in the genus Propebela Iredale, 1918, and two new species from off Southwestern Atlantic Argentine deep-waters. This new genus is characterized by small rhomboid shells with axial riblets and spiral cords, absent operculum, and radula of semi-enrolled marginal teeth. Both new species are distinguished from N. profunda by the presence of pustules covering the shell. Notopropebela pustulata sp. nov. was collected ranging from 530 to 2,845 m depth off Argentina within the Mar del Plata Submarine Canyon in the north and Burdwood Bank surroundings in the south. Notopropebela petu sp. nov., distinguished from N. pustulata by a larger spire and subsutural ramp, was described from material collected in 210 m off Buenos Aires province. Radula and details of the shell and protoconch of both new species were studied from material deposited in the collections of Museo Argentino de Ciencias Naturales (MACN) and Museo de La Plata (MLP). We conclude that the genus Propebela is absent from the Southwestern Atlantic.