LAYERORGAN & ORGAN SYSTEM EctodermNervous system Skin MesodermMuscles Circulatory System Skeletal System Reproductive System EndodermLining of gut and respiratory tracts Liver Pancreas
Animals With No Embryonic Stages Sponges Cnidarians Ctenophorans
Protostomes – blastopore becomes mouth Acoelomates – no body cavity –Platyhelminthes Draw the acoelomate body plan in your notes here. Pseudocoelomates – fake body cavity –Nematodes Draw the pseudocoelomate body plan in your notes here.
Deuterostomes – blastopore becomes anus All are Eucoelomates – true body cavity –Mollusks –Annelids –Arthropods –Echinoderms –Chordates Draw the eucoelomate body plan in your notes here.
Symmetry Assymmetry –Irregular shapes –Do not move –Sponges
Symmetry Radial Symmetry –Can divide into equal halves using many planes –Cnidaria (stinging animals) –Echinoderms (sea stars)
Symmetry Can only divide into left & right halves Most efficient for movement –Flatworms –Roundworms –Mollusks –Segmented Worms –Chordates