Pseudosuchia is a clade of reptiles that includes modern crocodiles and their extinct relatives. They are characterized by their unique skull structure and limb posture, which is more upright compared to other reptiles. Pseudosuchians first appeared during the late Triassic period and have since diversified into various forms. This group is part of the larger clade Archosauria, which also includes birds and their ancestors. Pseudosuchians played a significant role in the evolution of reptiles and have adapted to various ecological niches, from terrestrial predators to aquatic hunters.