| A | B |
|---|
| eucoelomate | an animal that has a true body cavity, that is, one with mesoderm |
| radula | a file like structure used by mollusks to obtain food |
| glochidia | young clams |
| marsupial gills | gills of the female clam that hold eggs and young clams (glochidia) |
| septum(a) | the mesentary that separates the segments in annelids (earthworms) |
| clitellum | an organ of reproduction found in earthworms. It produces mucus to contain sperm and to form the cacoon. |
| exoskeleton | a hard covering of chitin found on arthropods |
| cephalothorax | that part of the body of an arthropod that contains the head and thorax |
| tracheal tubes | breathing device of insects |
| book lungs | breathing device of spiders |
| Malphigian tubes | excretory organ of insects; enables them to conserve water |
| complete metamorphosis | development of insects in which the young are completely different than the adults |
| incomplete metamorphosis | development of insects in which the young look like the adults |
| anterior | refers to the front of the animal |
| posterior | refers to the back (tail region) of the animal |
| dorsal | refers to the top of the animal |
| ventral | refers to the bottom of the animal |
| gastric mill | the teeth inside of the stomach of the crayfish |
| dermal branchia | breathing device of starfish |
| tube feet | method of locomotion in starfish |
| protostome | an animal in which the mouth develops first during embryonic development; includes the mollusks, annelids, and arthropods |
| deuterostome | animal in which the mouth develops second during embryonic development; includes the echinoderms and chordates (vertebrates) |
