Orycterocetus

Orycterocetus is an extinct genus of sperm whale from the Miocene of the northern Atlantic Ocean.

==Classification== Orycterocetus is a member of Physeteroidea closely related to crown-group sperm whales. The type species, O. quadratidens, was first named by Joseph Leidy on the basis of two teeth, two partial mandibular rami, and a rib from Neogene deposits of Virginia. Two more species were subsequently described, O. cornutidens Leidy 1856 and O. crocodilinus Cope, 1868, the latter from the middle Miocene Calvert Formation. ==Description== The distinction between O. quadratidens and O. crocodilinus is tentative, based on subtle dental differences such as the quadrate root cross-section in O. quadratidens, with overlapping morphology including conical shape, open pulp cavities, and longitudinal fluting; formal synonymy has not been established due to uncertain provenance of the type material. No other species are definitively assigned to the genus, though fragmentary remains, such as a partial mandible from the late Miocene [Pietra lecces formation]] in southern Italy, suggest possible intraspecific variation or undescribed diversity; this specimen exhibits a longer symphysis (estimated 400–420 mm) and 10–13 mandibular alveoli, provisionally attributed to Orycterocetus sp. and hinting at larger-bodied variants. Some unrecorded species may have exceeded long.