Hylaeochampsidae is an
extinct family of
basal eusuchian crocodylomorphs thought to be closely related to the order
Crocodylia. It was first constructed by
Charles William Andrews in 1913 to include just one member:
Hylaeochampsa. However, a new genus named
Iharkutosuchus was described in 2007 and was found to be a
sister taxon of
Hylaeochampsa, and thus a member of the family Hylaeochampsidae. The genus
Heterosuchus, named in 1887, may also be a member of the family. However, it is likely to be
synonymous with
Hylaeochampsa and has been considered a
nomen dubium by James M. Clark and Mark Norell. Clark and Norell also claimed that there is no evidence to suggest that the two genera form a true
clade distinct from other eusuchians, because remains associated with
Heterosuchus are to fragmentary to show any clear phylogenetic relationship. A fourth genus called
Pietraroiasuchus was assigned to Hylaeochampsidae in 2011. A phylogenetic analysis conducted with the description of
Pietraroiasuchus also found
Pachycheilosuchus to be part of the family.
