32-deuterostmod

32-deuterostmod - Gnathostomes = jawed mouths Jaw evolution...

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Kingdom Animalia Deuterostome Animals
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Remember the 4 deteurostome development characteristics 2 worm-like groups near the base of this part of the tree (2/11): Acoelamorphs Xenoturbellids
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P: Echinodermata = “spiny- skinned”
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Echinoderm anatomy Water vascular system
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Another C: “sea daisies”
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P: Hemichordata = acorn worms & pterobranchs
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somites Important chordate characteristics
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SP: Urochordata = tunicates sea squirts (ascidians), salps, appendicularians adult larva
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SP: Cephalochordata = lancelets tentacles Pikaia (Wikipedia)
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Hox gene clusters Fig 17-13 Craniates distinctive head (skull, brain, sense organs) active predators duplicated Hox genes
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Craniate features (cont.) new neural crest tissue more complex organs Haikouella (fossil; Wikipedia ) Fig 51- 11
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SP:
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Early vertebrates agnathans Haikouichthyes (Wikipedia) conodonts ostracoderms (Wikipedia)
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C: Myxini = hagfishes
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C: Petromyzontidae (Cephalaspidomorpha) = lampreys
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Unformatted text preview: Gnathostomes = jawed mouths Jaw evolution Gnathostomes more gene duplication forebrain larger lateral line mineralization C: Chondrichthyes = cartilaginous fish Clade Osteichthyes C: Actinopterygii = ray-fin fishes Garibaldi (CA marine fish) C: Actinistia = coelocanth C: Dipnoi = lungfish Clade Sarcopterygii Early Tetrapods (many of these added in the last 20 years) (Wikipedia) Tetrapods C: Amphibia O: Anura = frogs & toads O: Apoda = caecilians O: Urodela = newts & salamanders Ichthyostega Clade Amniotes Amniotic egg C: Reptilia C: Reptilia Birds Adaptations for flight C: Mammals Protherians = Monotremes = egg-layers spiny echidna C: Mammals Metatherians = Marsupials = pouched mammals C: Mammals Eutherians = placental mammals Convergent evolution...
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32-deuterostmod - Gnathostomes = jawed mouths Jaw evolution...

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