Two Soft-Bodied Fossil Aglaspids (Tremaglaspis) - Fezouata Formation

This is a colorful pair of fossil Aglaspids (Tremaglaspis) from the Upper Fezouata Formation of Morocco. One specimen is 3.3" long and the other is 2.8" in length.

Aglaspids are a rare type of arthropod which was probably related to trilobites. For a while they were regarded as the ancestors to horseshoe crabs, though this theory has fallen out of favor.

A paper on these aglaspids can be found at the link below.

Ordovician faunas of Burgess Shale type