Pygocephalomorphs — Late Paleozoic “Shrimps” and “Crayfish”

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Abstract

Pygocephalomorphs are ancient crustaceans that inhabited marine and fresh waters during the Late Paleozoic and disappeared during the Great Permian extinction. Despite the outward resemblance to lobsters and shrimps, pygocephalomorphs belong to the peracariids, a group that includes woodlice and amphipods. Therefore, they are one of the clearest examples of convergence among the diversity of arthropods. In the fossil record, the remains of these animals are quite rare, and each new discovery sheds light on the evolution and lifestyle of these mysterious crustaceans.

About the authors

E. V Mychko

Shirshov Institute of Oceanology, Russian Academy of Sciences; Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences; Borissiak Paleontological Institute, Russian Academy of Sciences

Email: eduard.mychko@gmail.com
Moscow, Russia; Moscow, Russia; Moscow, Russia

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