Large Triarthrus Trilobite from Quebec

Description: This is a Triarthrus becki trilobite subspecies from Quebec, Canada. Members of the related species Triarthrus eatoni have been found with soft tissues preserved as pyrite (see my other offerings), making the morphology of the genus well-known and useful for illustration of trilobite anatomy. This is an immense example of the taxon. While the cephalon is somewhat eroded, it is the only example I have seen. Note the sharp pleural spines on the distal segments.