Species: utahensis GILMORE, 1946
Etymology: In reference to the State of Utah, where the specimen was discovered.
Holotype: USNM 15996
Locality: "Myton Pocket," Uinta Basin, Uinta County, Utah.
Horizon: Myton member.
Age: Eocene Epoch, Paleogene Period, Lower Tertiary Subera, Lower Cenozoic Era.
Material: Slightly incomplete skull, right ramus and both ends of the left, distal ends of the left tibia and fibula, tarsus, and 4 metatarsals lacking there distal ends.
Number: Not given: Right ramus lacking the posterior end, and a fragment of a maxilla.
Species: kayi (MOOK, 1941)
= Hassicosuchus kayi MOOK, 1941
Holotype: CM 9600
Locality: Levitt Creek, about 5 miles east and south of Mountain View, Uinta County, Wyoming.
Horizon: Black's Fork Member, Bridger Formation.
Age: Bridgerian, Early Eocene Epoch, Paleogene Period, Lower Tertiary Subera, Lower Cenozoic Era.
Material: Skull missing anterior tip, lower jaw and skeleton.