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34‐3
 ANCESTRAL
 DEUTEROSTOME
 Notochord
 Common
ancestor
 of
chordates
 Chordate
phylogeny
 Lancelets
 Tunicates
 Hagfishes
 Head
 Vertebral
column
 (sister
group
t Fig.
34.2
Chordate
phylogeny
o
chordates)
 Chordates
 Echinodermata
 Chordate
phylogeny
 Lancelets
 Notochord
 Common
ancestor
 of
chordates
 Head
 Vertebral
column
 Jaws,
mineralized
skeleton
 Lungs
or
lung
derivatives
 Lobed
fins
 Fig.
34.2
Chordate
phylogeny
 Tunicates
 Hagfishes
 Lampreys
 Chordates
 Craniates
 Craniates
 Lampreys
 Sharks,
rays,
skates,
etc.
 Ray‐finned
fishes
 Coelacanths
 Lungfishes
 Amphibia
(frogs,
 salamanders)
 Legs
 Tetrapods
 Lobe‐fins
 Gnathostomes
 Osteichthyans
 Vertebrates
 Vertebrates
 Gnathostomes
 Osteichthyans
 Jaws,
mineralized
skeleton
 Lungs
or
lung
derivatives
 Lobed
fins
 Ray‐finned
fishes
 Coelacanths
 Lungfishes
 Amphibia
(frogs,
 salamanders)
 Legs
 Tetrapods
 Lobe‐fins
 http://haysvillelibrary.files.wordpress.com/2009/02/tiktaalik‐3.jpg
 Reptilia
 Fig.
34‐2
 Amniotic
egg
 Milk
 (turtles,
snakes,
 crocodiles,
birds)
 Reptilia
 Amniotes
 Amniotes
 Mammals
 Fig.
34‐2
 Amniotic
egg
 Milk
 (turtles,
snakes,
 crocodiles,
birds)
 Mammals
 ANCESTRAL
 DEUTEROSTOME
 Notochord
 Common
ancestor
 of
chordates
 Chordate
phylogeny
 Lancelets
 Tunicates
 Hagfishes
 Head
 Vertebral
column
 (sister
group
t Fig.
34.2
Chordate
phylogeny
o
chordates)
 Chordates
 Echinodermata
 A...
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