Clade distinguishing characteristics (LO 2 for lab test 3 A+E)

Eumetazoa

Animals with true tissues (all animals except sponges); includes all major animal groups except Porifera

Cnidaria

Radially symmetrical, diploblastic animals with stinging cells (cnidocytes); includes jellyfish, sea anemones, and corals

Bilateria

Bilaterally symmetrical, triploblastic animals with three germ layers; includes most animal phyla

Lophotrochozoa

A major clade of protostomes with either a lophophore feeding structure or trochophore larval stage; includes flatworms, mollusks, and annelids

Platyhelminthes

Flatworms; acoelomate, triploblastic, bilaterally symmetrical animals with no circulatory or respiratory systems

Mollusca

Soft-bodied animals usually with a hard calcium carbonate shell; body plan includes a foot, visceral mass, and mantle (e.g., snails, clams, octopuses)

Annelida

Segmented worms with a true coelom and closed circulatory system; includes earthworms, leeches, and polychaetes

Ecdysozoa

Clade of protostomes that grow by molting (ecdysis); includes nematodes and arthropods

Arthropoda

Segmented animals with jointed appendages and exoskeleton made of chitin; includes insects, arachnids, crustaceans

Myriapoda

Subgroup of arthropods with many body segments and legs; includes centipedes and millipedes

Crustacea

Mainly aquatic arthropods with two pairs of antennae and biramous appendages; includes crabs, lobsters, shrimp

Insecta

Most diverse group of animals; have a three-part body (head, thorax, abdomen), six legs, and usually wings