| A | B |
|---|
| phylum lacking true tissues | Porifera |
| phylum with radial symmetry, diplobastic | Cnidaria |
| phylum that is acoelomate, bilateral symmetry,& triploblastic | Platyhelminthes |
| phylum that is pseudocoelomate, aquatic, & the smallest animals | Rotifera |
| phylum that is pseudocoelomate, cylindrical, with only longitundinal muscles | Nematoda |
| phylum that is coelomate, has a mantle, musclular "foot", and visceral mass | Mollusca |
| phylum that is coelomate, segmented, with cerebral ganglia | Annelida |
| phylum that is coelomate, segmented, jointed appendages, with exoskeleton | Arthropoda |
| phylum that is a simple deuterostome with radial symmetry and a water vascular system | Echinodermata |
| germ layer that forms the outer surface and nervous system | ectoderm |
| innermost germ layer forms the linings of the gut | endoderm |
| middle layer of triploblastic animals | mesoderm |
| no body cavities except for the digestive tract | acoelomate |
| fluid filled body cavity completely lined with mesoderm | coelomate |
| collar cell has a flagellum to move water | choanocyte |
| wandering cell in a sponge, ingests, digests, and distributes nutrients | amoebocyte |
| flexible skeletal fibers in sponges | spongin |
| sharp, calcium carbonate or silica structures in sponges | spicules |
| contained in stinging cells of cnidarians | nematocysts |
| bell-shaped floating form of cnidarians | medusa |
| cylindrical form of cnidarians that are sessile | polyp |
| specialized excretory cell in flatworms | flame cell |
| specialized mouth of a flatworm that attaches to the host | scolex |
| tissue that secretes the shell in mollusks | mantle |
| rasping, scrasping tongue of mollusks | radula |
| main component in the arthropod skeleton | chitin |
| respiratory apparatus of arachnids | book lungs |
| respiratory organ found in crustaceans | gills |
| respiratory system found in insects | tracheal system |
| highly vascularized paddles used for locomotion and gas exchange in polychaetes | parapodia |
| mollusk with two shells, filter feeder | Bivalvia |
| stomach footed molluscan, snails and slugs | Gastropoda |
| head footed molluscan, squids and octopi | Cephalopoda |
| arthropods with 8 legs, chelicerae, and cephalothorax | Arachnida |
| 6 legs, three distinct body regions | Insecta |
| worm-like arthropods with 2 pair legs per segment | Diplopoda |
| class that includes lobsters, crabs, shrimp, crayfish | Crustcea |
| one pair of legs per segment with poison claws tipping the ends | Chilopoda |
| structures that produce the strongest fibers known to man | spinnerets |
| class for leeches | Hirudinea |
