Protosuchus

Not to be confused with Postosuchus.

Protosuchus (from Greek: protos, "first" and Greek: souchos, "crocodile")^[1] is an extinct genus of carnivorous crocodyliform from the Early Jurassic. It is among the earliest animals that resemble crocodilians. Protosuchus was about 1 metre (3.3 ft) in length and about 40 kilograms (88 lb) in weight.

Life restoration of Protosuchus

The skull of Protosuchus richardsoni (AMNH 3024)

The pelvis and hindlimbs of Protosuchus richardsoni (AMNH 3024)

Protosuchus richardsoni fossil AMNH 3024

Protosuchus Temporal range: Early Jurassic
A cast of Protosuchus richardsoni (AMNH 3024) in the American Museum of Natural History
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Clade:	Pseudosuchia
Clade:	Crocodylomorpha
Family:	†Protosuchidae
Genus:	†Protosuchus Brown, 1934
Species
P. richardsoni (Brown, 1933) (type) P. haughtoni (Busbey and Gow, 1984) P. micmac Sues et al. 1996
Synonyms
Archaeosuchus Brown, 1933 (preoccupied) Baroqueosuchus Busbey and Gow, 1984 Lesothosuchus Whetstone and Whybrow, 1983

As an early crocodilian relative, its skull featured more crocodilian characteristics than its earlier ancestors; it had short jaws that broadened out at the base of the skull, providing a large surface to which its jaw muscles could attach. This increased the maximum gape of the animal's mouth and the force with which the jaws could be closed. The dentition of the animal also resembled modern crocodiles, including the teeth in the lower jaw that fitted into notches on either side of the upper jaw when the mouth was closed.^[2] It also possessed a powerful tail which later developed into a propulsion mechanism through water in its descendants.

The body was covered and reinforced by osteoderms in a double row along the back and covering the bottom of the body and the entire tail. It was an unusual quadrupedal reptile whose legs were columnar, with the rear legs longer than the front legs. Its five toes were clawed and it is believed that they were good runners and good swimmers.^{[citation needed]}

Species

Three species of Protosuchus have been described: the type species P. richardsoni ^[3] from Arizona, United States, P. micmac^[4][5] from Nova Scotia, Canada and P. haughtoni ^[6] from South Africa.