Do the clothes make the thylacocephalan? A detailed study of Concavicarididae and Protozoeidae (?Crustacea, Thylacocephala) carapace micro-ornamentation

Thylacocephalans are an enigmatic group of marine arthropods allied with crustaceans. Their fossil record consists predominantly of isolated carapaces which contain relatively few systematically useful characteristics besides the hard-to-quantify outline. The micro-ornamentation patterns contribute a new suite of systematically useful characters that seem to be invariant within species and easily segregated into one of three types – linear,...