At the time, Compagno chose to maintain Pseudotriakis as the sole member of the family Pseudotriakidae because of its numerous unique traits. More recently, he and other taxonomists have increasingly tended to group Gollum and Pseudotriakis together in the family Pseudotriakidae.
Compagno's initial classification of Pseudotriakis as a distinct family within the Pseudotriakidae group has been challenged by recent taxonomic studies that suggest a closer relationship between Gollum and Pseudotriakis.