Kingdom Animalia Deuterostome Animals
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Transcript of Kingdom Animalia Deuterostome Animals
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Kingdom AnimaliaDeuterostome
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
tentaclesPikaia(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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Gnathostomes = jawed mouths
Jaw evolution
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Gnathostomes
more gene duplication
forebrain larger
lateral line
mineralization
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C: Chondrichthyes = cartilaginous fish
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Clade Osteichthyes
C: Actinopterygii = ray-fin fishes
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Garibaldi (CA marine fish)
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C: Actinistia = coelocanth
C: Dipnoi = lungfish
Clade Sarcopterygii
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Early Tetrapods
(many of these added in the last 20 years)
(Wikipedia)
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Tetrapods
C: AmphibiaO: Anura = frogs & toads
O: Apoda = caecilians
O: Urodela = newts & salamanders
Ichthyostega
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Clade Amniotes
Amniotic egg
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C: Reptilia
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C: Reptilia
Birds
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Adaptations for flight
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C: Mammals
Protherians = Monotremes = egg-layers
spiny echidna
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C: Mammals
Metatherians = Marsupials = pouched mammals
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C: Mammals
Eutherians = placental mammals
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Convergent evolution