Nerve activates contraction

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Chapter 34 Vertebrate Evolution and
Diversity (Chordata)
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33.02 A traditional view of animal diversity
based on body-plan grades
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Clock analogy for some key events in evolutionary
history
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34.2 Hypothetical phylogeny of chordates
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34.19 Skeleton of Acanthostega, a Devonian
tetrapod.Derived appendages of tetrapods
combined with primitive aquatic adaptations
(gills)
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34.18 A coelocanth (Latimeria), the only extant
lobe-finned genus
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34.2 Hypothetical phylogeny of chordates
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34.24 Amniotic egg
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34.3 Chordate characteristics.All chordates
possess the four structural derived characters at
some point during their development.
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34.2 Hypothetical phylogeny of chordates
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34.4 Subphylum Urochordata a tunicate
Paedogenesis Development of sexual maturity in
larva)
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34.5 Subphylum Cephalochordata lancelet anatomy
somites
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Subphylum Cephalochordatathe lancelet
Branchiostoma
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34.2 Hypothetical phylogeny of chordates
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34.9 A hagfish(Myxini)
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34.10 A sea lampreyCephalaspidomorphi (used to
be pooled with hagfishes into the Agnatha)
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Lamprey on trout
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34.2 Hypothetical phylogeny of chordates
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34.13 Hypothesis for the evolution of vertebrate
jaws
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34.15 Cartilaginous fishes (class
Chondrichthyes)Great white shark (top left),
silky shark (top right), southern stingray
(bottom left), blue spotted stingray (bottom
right)
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Whale shark
Basking shark
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34.2 Hypothetical phylogeny of chordates
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Ray-finned fishes (class Actinopterygii) yellow
perch
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34.17. Ray-finned fishes (class Actinopterygii)
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34.16 Anatomy of a trout, a representative
ray-finned fish
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Lake trout
Whitefish
Sturgeon
Great Lakes
Walleye
Some of the natives
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Rainbow trout/brown trout
Great Lakes
Some Exotics
Alewife
Smelt
Round goby
Ruffe
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Bluegill
Yellow perch
Great Lakes
Some successors
Largemouth bass
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Ottawa River UT Campus
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Some University of Toledo campus residents
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Species List
A northern pike captured in the downstream site.
The northern pike is generally associated with
the pristine waters of the north in Michigan,
Wisconsin, Minnesota, and throughout Canada. The
fish in the photograph marks the second year in a
row where a pike was found while sampling. This
ends the question whether the first fish was an
anomaly The Ottawa River is the habitat of the
northern pike! Species found downstream with
value for recreational sport fishing
Northern pike Bluegill sunfish
Pumpkinseed sunfish Largemouth bass
Yellow perch
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• Ottawa Hills, just West of Secor Rd., upstream
  from UT (facing East).
• Ca. 17 m across and 2.5 m above streambed
• Three openings with flap gates near bottom of
  dam
• Farthest down-stream obstruction

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7 April 2005
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34.2 Hypothetical phylogeny of chordates
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Arrange these taxonomic terms from the most
inclusive (most general) to the least inclusive
(most specific) (1) tetrapods (2)
chordates (3) amphibians (4) gnatostomes (5)
vertebrates

• 5, 1, 3, 2, 4
• 1, 2, 3, 4, 5
• 2, 5, 4, 3, 1
• 3, 4, 1, 5, 2
• 2, 5, 4, 1, 3

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Lobe-finned (coelacanth) fishes
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Lung fishes