Echinocaris punctata   scale in cms CLASS - Malacostraca ORDER - Archaeostraca FAMILY - Echinocarididae GENUS/SPECIES - Echinocaris punctata ROCK UNIT -Windom Member of the Moscow Formation AGE - Middle Devonian (380 million years old) LOCALITY - Tully, New York, USA Phyllocarids are an ancient group of arthropods whose body resembles a spiked-tailed shrimp within partially opened clam shells. The specimen above represents only the "clam shell" part of the carapace. Phyllocarids are known from the Cambrian Period to the present and represent the oldest group of malacostracans (shrimp or crab-like animals). PRI 43491