Redlichiids

Redlichiids are an extinct family of trilobites, a group of marine arthropods that lived from the Cambrian to the Permian periods. They are particularly characteristic of the Early Cambrian and are among the earliest well-known trilobites. Redlichiids are distinguished by their large, often unsegmented, glabella (the central raised area of the head shield) and their long, tapering tail shield (pygidium). Many species also possessed prominent spines, particularly on the head shield and the sides of the body segments.

This family is found in marine sedimentary rocks globally, with significant occurrences in Cambrian deposits of Asia, Australia, Europe, and North America. Their widespread distribution and abundance make them important index fossils for correlating Cambrian rock layers. The diversity within Redlichiidae is considerable, with numerous genera and species described. Their evolutionary relationships and precise placement within the broader trilobite phylogeny have been subjects of ongoing research. Redlichiids represent an early experiment in arthropod evolution and provide valuable insights into the diversification of life during the Cambrian explosion.