20 terms

Evolutionary Tree

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Sponges
little or no symmetry
undergo cleavage and gastrulation
Radial Symmetry
diploblastic
diploblastic
two germ layers
triploblastic
three germ layers
acoelomates
no coelom
coelom
body cavity
pseudocoelomates
body cavity not completely lined by mesoderm
protostomes
first embryonic opening is mouth
deuterstomes
second embryonic opening is mouth
coelomates
body cavity completely lined by mesoderm
Porifera
sponges
cnidaria
jellyfish, coral (polyp & medusa); radial symmetry
platyheiminthes
flatworms, tape, & flukes; acoelomates
nematoda
round worms (2 openings); pseudocoelomates
Mollusca
clams, shells, octopi, muscles; protosomes
Annelida
annelids, worms, leeches, night crawlers, bugs without body segments
Arthropoda
lobsters, crabs, bugs with body segments
echinodermata
starfish, sand dollars; deuterostomes
hemichordate
acorn worm (have natal cords, no spinal cord); deuterostomes
chordata
have both natal and spinal cords (human); deuterstomes
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