Marrella splendens is an unusual arthropod known from fossils found in only a single stratum of the Middle Cambrian Burgess Shale of British Columbia. It is, however, the most common fossil in the Burgess Shale, with over 15,000 specimens catalogued. Marrella was the first fossil collected by Charles Walcott from the Burgess Shale. Walcott described Marrella informally as a "lace crab" and described it more formally as an odd trilobite. It was later reassigned to the now defunct class Trilobito… (More on Marrella)