euarchontans

Euarchontans is a proposed supraordinal clade of placental mammals. This grouping brings together several orders of mammals that share a common ancestor, including rodents and lagomorphs (together known as glires), primates, tree shrews, and colugos. The name "euarchontans" is derived from the Greek words "eu" meaning "true" and "archonta" meaning "rulers," reflecting their presumed ancient lineage and diversity.

The concept of euarchontans emerged from molecular phylogenetic studies, particularly those analyzing DNA sequences, which provided strong evidence for this evolutionary relationship. While morphological similarities exist, molecular data has been instrumental in solidifying this grouping. The glires, consisting of rodents and lagomorphs, were long suspected to be related, and their inclusion with primates, tree shrews, and colugos as euarchontans significantly altered previous classifications.

Within the euarchontan clade, the exact placement and relationships between the constituent orders are still a subject of ongoing research and refinement. However, the core grouping of glires and the Archonta (primates, tree shrews, and colugos) is widely accepted. Understanding the euarchontan clade is important for reconstructing the evolutionary history of mammals and for studying the diversification of these successful mammalian groups.