New Seguenziidae of the genus Ancistrobasis (Vetigastropoda: Seguenzioidea) from deep waters in the South Atlantic Ocean (Brazil)

• Main Authors: LIMA, Silvio Felipe Barbosa, CHRISTOFFERSEN, Martin Lindsey, BARROS, José Carlos Nascimento
• Format: Text
• Language: unknown
• Published: Station Biologique de Roscoff (SBR) 2013
• Subjects: South Atlantic Ocean
• Online Access: https://dx.doi.org/10.21411/cbm.a.1103273; http://application.sb-roscoff.fr/cbm/doi/10.21411/CBM.A.1103273

A new species of the family Seguenziidae Verrill, 1884 was discovered during dredging on the continental slope off northeastern Brazil. This species is described herein based on conchological features. Ancistrobasis zumbii sp. nov. is similar to A. costulata (Watson, 1879) and A. depressa (Dall, 1889) in having flattened whorls increasing regularly (except for the last whorl, which enlarges conspicuously), an inner lip with a rounded denticle and a funnel-shaped umbilicus. Ancistrobasis zumbii differs primarily in possessing a slight suprasutural angulation, slight axial ribs on the first teleoconch whorls and smooth, slightly undulated spiral threads.