Abstract

The study of a topotype of Bitubigera biseriata Philippi, 1843, figured by Reuss in 1864, allows some refinement of the genus Bitubigera d'Orbigny, 1852. The description of a new species [B. gardettensis] from the upper Helvetian [Miocene] of La Gardette, Villedieu (Vaucluse) [France], completes the diagnosis of the genus and its systematic position by the description of the ovicell.

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