| A | B |
|---|
| characteristics of animals | multicelled heterotrophs, needs oxygen form aerobic respiration; reproduces sexually and asexually; move at some stage; dev. from embryos |
| symmetry | radial and bilateral |
| radial | condition of having similar parts regularly arranged around a central axis |
| symmetry | one half is a mirror image of the other that is it has a left and right side and usually display cephalization |
| cephalization | must have a head |
| gut- complete | region where food is digested and then absobred; one opening for taking in food an expelling waste |
| gut - incomplete | opening at both ends; mouth and anus coelom |
| coelom | a peritoneum-lined cavity between the gut and body wall of most animals |
| sponges | no symmetry, no tissues, no organs, reproduce sexually, |
| cnidarians | nerve net, only animals that produce nematocysts, epithelial tissues, hydroskeleton, (jellyfish, corals, hydras) |
| platyhelminths | flatworms-flukes, tapeworms |
| planaria | flatworm |
| segmentation | repeating body units; units may or may not be similar to one another; |
| elephantiasis | wucheria bancrofti |
| annelids | segmented coelomate worms; bristleworm, leeches, earthworm |
| arthopods | hardened exoskeleton; jointed appendages; division of labor; |
| phylum arthopods | trilobites, chelicerates, crustaceans, uniramians |
| trilobites | all extinct |
| chelicerates | spiders, mites, scorpions, horsetail crab |
| crustaceans | crabs, shrimps, barnacles |
| uniramians | insects, centipedes, millipedes |
| molluscan diversity | gastropods, bivalves, cephalopods |
| incomplete metamorphosis | nymphs |
| complete metamorphisis | larvae |
| phylum mollusca | bilateral, soft bodied, coelomate, most have a shell or reduced version of one, most have a fleshy foot, many have a radula for shredding food (snail) |
| echinodermata | almost all are marine, body wall has spines, or plates of calcium carbonate, NO BRAIN, adults are radial with bilateral features (starfish) |
