<Tr> <Td> Cephalocarida </Td> <Td> horseshoe shrimp </Td> <Td> Brachypoda </Td> <Td> </Td> </Tr> <Tr> <Td> Maxillopoda </Td> <Td> barnacles copepods </Td> <Td> Calanoida Pedunculata Sessilia c. 20 others </Td> <Td> Chthamalus stellatus (Sessilia) </Td> </Tr> <Tr> <Td> Ostracoda </Td> <Td> seed shrimp </Td> <Td> Myodocopida Halocyprida Platycopida Podocopida </Td> <Td> Cylindroleberididae </Td> </Tr> <Tr> <Td> Malacostraca </Td> <Td> crabs lobsters crayfish shrimp krill mantis shrimp woodlice hooded shrimp scuds sandhoppers etc . </Td> <Td> Decapoda Isopoda Amphipoda Stomatopoda c. 12 others </Td> <Td> Gammarus roeseli (Amphipoda) </Td> </Tr>

Crustacea and hexapoda have what features in common