According to Brochu (2013), material from the middle Eocene of Italy and Texas may represent another yet unnamed species. The two Asian species of Planocrania were found to be most closely related to Boverisuchus using a phylogenetic analysis.
As stated by Brochu (2013), fossils from the middle Eocene in Italy and Texas could potentially represent an unidentified species. A study revealed that the two Asian species of Planocrania are closely linked to Boverisuchus via a phylogenetic examination.