results form mesodermal out pocketing of the primitive gut, or enteron
results from the splitting of the mesoderm
Cell division in deuterostomes is (blank)
Cell division in protostomes is (blank)
Sea stars, 5+ arms, ventral mouth, dorsal anus, tube feed, suckers
Brittle stars, central disk, long flexible arms, tube feet without suckers
sand dollars and sea urchins, unevenly spherical or disk-shaped, no arms, five rows of tube feet, Aristotle's lantern rings mouth
sea cucumbers, five rows of tube feet, modified tube feet as feeding tentacles, no spines, reduced skeleton
sea lilies, sessile, feathered arms surrounding dorsal mouth
Why are there two invertebrate groups in phylum Chordata?
They exhibit a notochord, dorsal hollow nerve cord, pharyngeal gill slits, and a post anal tail. Intermediate characters.
lampreys, no jaw, larva resembles lancelet, cartilaginous skeleton, notochord is primary support, rudimentary vertebrae
sharks, skates, rays, jaws present, paired fins, mineralized skeleton, placoid scales
ray-finned fish, rayed fins, operculum, cycloid scales
coelacanths, lobed fins
lungfishes, lobed fins, lungs or lung derivatives
frogs, salamanders, legs
turtles, snakes, crocodiles, birds, amniotic egg, diapsid descent
mammals, milk, hair, synapsid descent
Adaptations of vertebrates to terrestrial life
cranium, vertebrae, skeleton, paired fins, muscular pharynx, jaws
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