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The Fourth trochanter is a shared characteristic common to archosaur
Archosaur

Archosaurs are a group of diapsid reptiles represented by modern birds and crocodilians. This group also includes extinct non-avian dinosaurs, pterosaurs and relatives of crocodiles....
s. It is a knob-like feature on the femur
Femur

The femur, or thigh bone, is the most proximal bone of the leg in vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs....
 that serves as a muscle attachment.

This Fourth trochanter first appeared in the Erythrosuchidae
Erythrosuchidae

Erythrosuchidae are a family of large Basal archosauromorph carnivores that lived from the later Early Triassic to the early Middle Triassic ....
, large basal
Basal (phylogenetics)

In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group form an outgroup to the rest of the clade, such as in the following example:...
 archosaurian predators of the early Triassic
Triassic

The Triassic is a geologic period that extends from about 251 to 199 annum . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic....
 period.








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The Fourth trochanter is a shared characteristic common to archosaur
Archosaur

Archosaurs are a group of diapsid reptiles represented by modern birds and crocodilians. This group also includes extinct non-avian dinosaurs, pterosaurs and relatives of crocodiles....
s. It is a knob-like feature on the femur
Femur

The femur, or thigh bone, is the most proximal bone of the leg in vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs....
 that serves as a muscle attachment.

This Fourth trochanter first appeared in the Erythrosuchidae
Erythrosuchidae

Erythrosuchidae are a family of large Basal archosauromorph carnivores that lived from the later Early Triassic to the early Middle Triassic ....
, large basal
Basal (phylogenetics)

In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group form an outgroup to the rest of the clade, such as in the following example:...
 archosaurian predators of the early Triassic
Triassic

The Triassic is a geologic period that extends from about 251 to 199 annum . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic....
 period.