. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Proterochampsa and crocodile evolution • Sill 427 Stegomosuchus, Sphenosuchtis, Pcdetico- saurus, ISJotochampsa and, finally, Enjthro- champsa. Broom returned to the subject of Noto- champsa and Enjthrochampsa in 1927. He reviewed the work of Haughton and of von Huene and agreed to the generic sep- aration of Notocho77ipsa and Enjthrochamp- sa, but remained firm in his conviction that they are closely related and are true croco- diles. He modified the classifications of Haughton and von Huene by placing both genera in
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Proterochampsa and crocodile evolution • Sill 427 Stegomosuchus, Sphenosuchtis, Pcdetico- saurus, ISJotochampsa and, finally, Enjthro- champsa. Broom returned to the subject of Noto- champsa and Enjthrochampsa in 1927. He reviewed the work of Haughton and of von Huene and agreed to the generic sep- aration of Notocho77ipsa and Enjthrochamp- sa, but remained firm in his conviction that they are closely related and are true croco- diles. He modified the classifications of Haughton and von Huene by placing both genera in the Notochampsidae and refer- ring the family to the order Crocodilia. No further information regarding the an- cestry of crocodiles appeared until 1933, when Brown reported the well preserved crocodilian from the Upper Triassic or Lower Jurassic rocks of Arizona, to which he ga\e the name Piotosiicluis richarclsoni, erecting for it the family Protosuchidae. Unfortunately, as in the other early croco- diles, nothing is preserved of the palatal region of Protosiichiis. The following year (1934) Mook pre- sented a classification of the Crocodilia in which the Protosuchidae was placed in a new suborder, the Protosuchia, and no mention at all was made of either Noto- champsa or Enjthrochampsa as members of the Crocodilia. Romer (1945) combined Protosuchus, ISJotochampsa, Enjthrochampsa and, questionably, Pcdcticosaurus in the family Notochampsidae. In 1951 Colbert and Mook published a thorough descrip- tion of Protosuchus, and placed Noto- champsa and Enjthrochampsa in the sub- order Protosuchia as members of the family Protosuchidae. Kiilin (1955) modified Colbert and Mook's classification b\- removing Noto- champsa and Enjthrochampsa from the Protosuchidae and reuniting them in the Notochampsidae. He recognized the sub- order Protosuchia and referred the Noto- champsidae to it. The current classification of ancestral crocodilians is as follows: Protosuchia Protosuchidae. Fig.
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