Phyllocarida is a subclass of

crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean gro ...

s, comprising the extant order

Leptostraca Leptostraca (from the Greek words for ''thin'' and ''shell'') is an order of small, marine crustaceans. Its members, including the well-studied '' Nebalia'', occur throughout the world's oceans and are usually considered to be filter-feeders. It ...

and the extinct orders Hymenostraca and Archaeostraca.

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Malacostraca Arthropod subclasses Paleozoic crustaceans Mesozoic crustaceans Cenozoic crustaceans Extant Cambrian first appearances Taxa described in 1879 Taxa named by Alpheus Spring Packard {{Malacostraca-stub

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