The holotype FMNH PR1821 is the only fully described specimen of Cryolophosaurus.
The specimen consists of an incomplete skull and mandibles lacking most of their front half; nine maxillary teeth; a fragmentary sixth cervical centrum; cervical vertebrae 7-10; several posterior cervical ribs; several anterior dorsal vertebrae; most mid and posterior dorsal vertebrae; several dorsal ribs; the fifth sacral vertebrae; three chevrons; many partial and complete caudal vertebrae and centra; two partial humeri; a proximal radius; a proximal ulna; a partial ilium; a proximal pubis; both ischia, but only one distal; two incomplete femora; the distal end of a tibia; the distal end of a fibula, and the astragalus and calcaneum.
In 2013, new material of Cryolophosaurus was unearthed in Antarctica.
The description of this material has not yet been published in a non-abstract form.

Cryolophosaurus was a large, well-built theropod, one of the largest of its time.
The genus has been described by Roger Benson and colleagues (2012) as a top predator in Antarctica.
It had slender proportions.
Cryolophosaurus was estimated as being 6 to 7 m (19.7 to 23.0 ft) in length by William R. Hammer & William J. Hickerson (1999).
A 2007 study by Nathan Smith et al.
revised the length to 6.5 m (21.3 ft).
Its weight estimated at 465 kilograms (1,025 lb).
Based on these length and weight estimates, Cryolophosaurus is currently the largest known Early Jurassic theropod.
Smith et al. (
2007b) and Benson et al. (
2012) noted that the holotype individual probably represents a sub-adult, so adults could have been larger.
In 2016 Molina-Pérez and Larramendi gave a larger estimation of 7.7 meters (25.3 ft) and 780 kg (1.720 lbs).
The holotype FMNH PR1821 is the only fully described specimen of Cryolophosaurus. The specimen consists of an incomplete skull and mandibles lacking most of their front half; nine maxillary teeth; a fragmentary sixth cervical centrum; cervical vertebrae 7-10; several posterior cervical ribs; several anterior dorsal vertebrae; most mid and posterior dorsal vertebrae; several dorsal ribs; the fifth sacral vertebrae; three chevrons; many partial and complete caudal vertebrae and centra; two partial humeri; a proximal radius; a proximal ulna; a partial ilium; a proximal pubis; both ischia, but only one distal; two incomplete femora; the distal end of a tibia; the distal end of a fibula, and the astragalus and calcaneum. In 2013, new material of Cryolophosaurus was unearthed in Antarctica. The description of this material has not yet been published in a non-abstract form.
Cryolophosaurus was a large, well-built theropod, one of the largest of its time. The genus has been described by Roger Benson and colleagues (2012) as a top predator in Antarctica. It had slender proportions. Cryolophosaurus was estimated as being 6 to 7 m (19.7 to 23.0 ft) in length by William R. Hammer & William J. Hickerson (1999). A 2007 study by Nathan Smith et al. revised the length to 6.5 m (21.3 ft). Its weight estimated at 465 kilograms (1,025 lb). Based on these length and weight estimates, Cryolophosaurus is currently the largest known Early Jurassic theropod. Smith et al. (2007b) and Benson et al. (2012) noted that the holotype individual probably represents a sub-adult, so adults could have been larger. In 2016 Molina-Pérez and Larramendi gave a larger estimation of 7.7 meters (25.3 ft) and 780 kg (1.720 lbs).
Cryolophosaurus