This article presents a morphological study based on light microscopic observations that revealed two morphotypes within the species Furcatolithus akropodus. The two morphotypes are distinguished by the presence or absence of a suture in the bifid spine. Recognising these differences and defining two distinct biostratigraphic ranges allowed us to differentiate the morphotypes into two species, F. akropodus and the new species F. xiphopodus, improving early Oligocene biostratigraphy.