First two powerpoints for bio 2 exam 2
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21 Terms
Body cavity structure
Acoleomates, psudeocoelomates, coelomates
Acoleomates
Flatworm
Psuedocoelomate
roundworms
coelomate
earthworm
Ctenophores
(comb jellies)
radial symmetry
cilia or 8 - comb like plates called ctenes
diploblastic
Placozoans
asymmetric
no mouth, no gut, or nervous system
cnidarians
(jellyfish)
gastrovascular
hydrostatic skeleton
nematosysts
Protostomes
Lovphotrochozoan, ecdysozoans, annelids
Distinct organ system splits post P and D
Chelicerates
2 -appendages modified by mouth parts (ex: horse shoe crab)
Arachnids
Spider
Mandibulates
mouthparts are mandibles (ex: segemented trunks w/ many pairs of legs)
Crustaceans
shrimps, etc, specialized appendages
hexapods (6 legs)
insects, gas exchange system
pterygote
insects - 1st flying animal
deuterstomes
Echinoderns, hemichordates, chordates
Deuterostomes have a common ancestor with
bilateral symmetry
segemented
pharyngeal slits present
Vertebrate jaw evolution
improved feeding efficiency
Early split in tetrapods led to amphibians and amniotes
Aminote egg
Archosaurs are crocidiles and
birds
Mammal key traits
sweat glands
mammary glands
hair
4 -chambered heart
