Exquisitely-Preserved Redlichiid Trilobite from Chengjiang Biota

Description: This trilobite is a member of the Order Redlichiida, Family Redlichiidae from the Early Cambrian Heilinpu Formation deposits near Anning, in Kunming County, Yunnan Province, China, known as Eoredlichia intermedia. The species is one found in several locations within Yunnan Province in what is termed the Chegjiang Biota by Hou Xian-guang in 1984. The diversity of soft-tissue fossils is astonishing: algae, medusiforms, sponges, priapulids, annelid-like worms, echinoderms, arthropods (including trilobites), hemichordates, chordates, and the first agnathan fish make up just a small fraction of the total. Numerous problematic forms are known as well, some of which may have represented failed attempts at diversity that did not persist to the present day.

The Redlichioids of this type are considered to be the sister-group comprising all of the “higher” (non-Olenelloid) trilobites by Richard Fortey. Eoredlichia is thought to have lived on or close to the seafloor. Based upon its spinose limb bases and braced hypostome, it is thought by some researchers to have led a predatory existence. While this specimen has repaired cracks to the matrix, it is still a highly desirable specimen due to its association with the Chengjiang Biota that made up a glimpse of the Cambrian Explosion some 5-10 million years before the Burgess Shale fauna came into being. Notice the sweeping spines that have been preserved.