Razanandrongobe sakalavae is the oldest and largest representative of Notosuchia

Razanandrongobe sakalavae is a large predatory archosaur from the Middle Jurassic (Bathonian) of the Mahajanga Basin, NW Madagascar. It was diagnosed on the basis of teeth and a fragmentary maxilla, but its affinities were uncertain.
Deep and massive jaw bones armed with enormous serrated teeth that are similar in size and shape to those of a T-rex strongly suggest that these animals fed also on hard tissue such as bone and tendon. The full name of the predatory crocodyliform (nicknamed "Razana") is Razanandrongobe sakalavae, which means "giant lizard ancestor from Sakalava region".
A combination of anatomical features clearly identify this taxon as a Jurassic notosuchian, close to the South American baurusuchids and sebecids, that were highly specialized predators of terrestrial habits, different from present-day crocodilians in having a deep skull and powerful erect limbs. Razanandrongobe sakalavae is by far the oldest—and possibly the largest—representative of the Notosuchia, documenting one of the earliest events of exacerbated increase in body size along the evolutionary history of the group.
Based on available remains, Razanandrongobe is the largest known Jurassic member of the Mesoeucrocodylia. In life, the length of its skull likely surpassed that of Barinasuchus,which has been estimated at 88 cm (35 in) long.

Erythrosuchus

Erythrosuchus (red crocodile) is an extinct genus of archosauriform reptile from the Triassic of South Africa and Namibia. Remains have been found from the Cynognathus Assemblage Zone of the Beaufort Group in the Karoo of South Africa as well as the Omingonde Formation in Namibia.
In the Late Triassic, the ecological niche left by Erythrosuchus was filled by creatures like Saurosuchus and Postosuchus.
Erythrosuchus was the largest predator of its time, at around 5 metres (16 ft) long and 2.1 metres (6.9 ft) tall[citation needed]. It walked on all fours and had limbs which were positioned semi-vertically under its body, unlike the more sprawling gait of most earlier reptiles. Its head was large and dinosaur-like, reaching a length of 1 metre (3.3 ft), and had sharp, conical teeth. Erythrosuchus was the largest erythrosuchid, but apart from its size, it was similar in appearance to other related genera. It had a large head and comparatively short neck. One of the few distinguishing features of Erythrosuchus other than its size is the smoothness of the margin of the squamosal, a bone at the rear of the skull. In other erythrosuchids, the margin of this bone projects backward from the skull, giving it a hook-like appearance. In Erythrosuchus, the margin is convex and lacks a hook.
The braincase has also been studied, and possesses features that are shared with other early archosauriforms. Many of these characteristics are considered plesiomorphic, or ancestral, in archosaurs. While Erythrosuchus is not considered an archosaur, it is thought to be closely related to the last common ancestor of all archosaurs.
The hypothetical last common ancestor of archosaurs is thought to have shared many features with Erythrosuchus, many of which are found in the braincase. For example, the inner part of the otic capsule (the skeletal structure surrounding the inner ear) is not entirely ossified, or completely formed of bone. Neither is the channel for the perilymphatic duct, which is a tube that leaves the lagena.The lagena is the portion of the inner ear responsible for hearing, and is known as the cochlea in mammals (although in mammals it is coiled rather than straight). Erythrosuchus has a short lagena, which is also expected in the last common ancestor of all archosaurs.
Some features of the ankle of Erythrosuchus suggest that it was beginning to adapt toward digitigrady, or walking on toes rather than having the entire foot placed on the ground. The ankle is similar to that of Euparkeria; the ankles of both of these animals are more advanced than those of other archosauriformes.