lepidosauromorph

Lepidosauromorph is a clade of reptiles that includes the Squamata (lizards, snakes, and amphisbaenians) and the Sphenodontia (tuataras). These two groups share a number of derived characteristics, distinguishing them from other reptile lineages. Historically, lepidosauromorphs were often grouped with lizards and snakes under the term "Lepidosauria," but modern phylogenetic analyses have refined this classification, placing them as a distinct branch within the larger Diapsida group.

Key features uniting lepidosauromorphs include a specialized ankle joint, the presence of ectodermal scales, and certain cranial features. The evolution of these traits has allowed for the diverse adaptations seen in modern lizards, snakes, and tuataras, which inhabit a wide range of environments across the globe. The fossil record of lepidosauromorphs extends back to the Triassic period, providing insights into the early diversification and evolutionary relationships of these reptiles. Understanding lepidosauromorph phylogeny is crucial for comprehending the broader evolutionary history of reptiles and the relationships between major reptilian groups.