<Tr> <Td> Kingdom: </Td> <Td> Animalia </Td> </Tr> <Tr> <Td> Clade: </Td> <Td> Euarthropoda </Td> </Tr> <Tr> <Td> Subphylum: </Td> <Td> Crustacea </Td> </Tr> <Tr> <Td> Order: </Td> <Td> † Hymenocarina </Td> </Tr>

Burgess shale fossils illustrate the origin of the mandibulate body plan