Phoberodon was described in 1926 from a partially complete skeleton with a
skull (
holotype MLP 5-4) lacking the earbones, which was found in the
Colhuehuapian Gaiman Formation of
Chubut Province, Argentina. Subsequent authors either followed Cabrera (1926) in classifying
Phoberodon as a squalodontid, or considered it a relative of
Waipatia although the genus was included in any cladistic analysis of archaic odontocetes. However, known specimens lack a periotic, which incorporates most defining synapomorphies of Squalodontidae, and Viglino et al. (2018) recovered
Phoberodon as distantly related to
Squalodon. == Palaeobiology ==