Phylum Porifera. no symmetry, tissues or organs sessile (=attached) filter feeders – have incurrent pores to allow food to enter reproduce by budding hermaphroditic. Phylum Cnidaria. jellyfish, hydras, sea anemones tissues 2 layers – ectoderm and endoderm
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Life cycle video
* Bilateral Symmetry
* Most are vertebrates ( 47,000 species)
Compared to 2,100 invertebrate chordates
* Share embryonic similarities:
*Notochord – dorsal rod supports body becomes backbone in most.
*Nerve cord – runs parallel to notochord – becomes spinal cord and brain
*Slits in pharynx ( Pharyngeal slits)
*Embryos have tails that extends past anus
Octopus vs Shark
-Osteo = bone
-ichthyes = fish