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Elrathia kingii Trilobite Fossil with PREDATORY BITE MARK from Anomalocaris

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Elrathia kingii Trilobite Fossil with PREDATORY BITE MARK from Anomalocaris

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This Elrathia trilobite has a bite mark from an Anomalocaris, one of the top predators in the Cambrian seas. Anomalocaris propelled itself through the water by undulating the flexible lobes on the sides of its body, which it used to draw in prey to it's "cookie-cutter" like mouth to bite through shells of other arthropods. This specimen is on a piece of the Wheeler Shale from Utah.

Specimens, which display predatory activity, are incredibly rare to find in the Utah Wheeler Shale fauna, typically in a year several thousand specimens are found of either molts or complete trilobites, however maybe only 1 or 2 show predatory marks as well defined as this.

Specimen 1 (w/bite mark): 3.2 x 2.5 in.

Specimen 2 : 3.5 x 2.2 in.

1 inch = 2.54 cm



Elrathia kingii (Meek, 1870)
Cambrian Age (542-488 Ma)
House Range & Drum Mountains, Western Utah, USA (Wheeler Formation)

Order : Ptychopariida
Sub-order : Ptychopariina
Super-family : Ptychoparioidea
Family : Ptychopariidae
Genus : Elrathia
Species: kingii

Quarried from near Delta, Utah, these trilobites come from one of the USA's largest Cambrian Age outcrops! Specimens like this found in the shale layer make for beautiful contrast against the grey colored matrix and pitch black calcite fossil for study or display specimens. Even though the generic name Elrathia was first published in the combination E. kingii, a species from the House Range Utah, the name name is derived from Elrath, Cherokee County, Alabama, where the fossil trilobites were first discovered.

These trilobites were thought to have been scavenging feeders in cold waters, along the sea floors, eating dead remnants and algae, traversing the oceans in large schools.

Rather than the basic "steel wool" prep, this has been micro-blasted in a lab setting for ultimate detail preservation of the specimen.