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Phyllocarids belong to a subclass of crustaceans that include the extinct order of Hymenostraca. They had a large external, dorsally hinged carapace that covered the cephalothoracic region that contained multisegmented paired appendages and rounded mandibles. Phyllocarids are thought to have had a lifestyle very similar to shrimps. They are morphologically varied, have extant relatives, and an extensive and long-ranging fossil record (Rolfe, 1969)
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Phyllocarida
Branchiocaris
Early evolution of Phyllocarid arthropods: Phylogony and Systematics of Cambrian-Devonian Archaeostracans
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