Triarthrus eatoni

Incredible piece, sandblasted (hence all the details have been able to be removed), with antennae and legs, measuring about + 7.5 × 6.5 cm. The trilobite measures ± 1.5 cm, including antennas, and is mineralized in pyrite. Next to it there is another trilobite, but this one is in a ventral position.

Of the few species that are found in fossilized arthropods, this is demonstrated by the antennae that come out from underneath them, since the majority are mute (exoskeleton).

Late Ordovician, Whetstone Gulf Formation