- Elrathia kingii
- Middle Cambrian Age
- Wheeler Shale
- Millard County, Utah
- The Trilobite Measures approx. 1 1/8″ long and will come in the 3.25″ x 4.25″ Riker Mount with Label as Shown. This specimen retains its Free Cheeks…
(The facial sutures determine the boundary between the central cranidium (glabella and fixed cheeks) and the librigenae (free cheeks). Trilobite specimens often lack librigenae. They are lost during molting, and also disarticulate easily following the death of the trilobite.)
Elrathia is a genus of ptychopariid trilobite species that lived during the Middle Cambrian of Utah, and possibly British Columbia. E. kingii is a medium-sized trilobite with a smooth sub-ovate carapace that is tapered towards the rear. Thorax is usually 13 segments. Pygidium has four axial rings and a long terminal piece. Posterior margin of the pygidium has a long broad medial notch. Elrathia’s mouth parts and body shape suggest they were particulate feeders that scavenged on the ocean floor. An interesting fact about Elrathia is they are found in “Exareobic” Zones (Between the anoxic and hypoxic zones of an underwater environment.) which contained oxygen levels much lower than what was required by most other organisms to survive.