KEY DERIVED CHARACTERS
KEY DERIVED
CHARACTERS
Notocord
GROUP
Tunicates
Brain
Head
Lancelets
Hagfish
Vertebral column
Lamprey
Jaws, paired fins
Lungs or derivative
Sharks & rays
Bony fish
Lobed fins
Lung fish
Legs
Tetrapods
Amniotic egg
Reptiles
Mammary, hair
mammals
NOTES
Most ancestral, extant
chordate
Cephalization, most ancestral
extant craniate.
Subgroup of chordates:
Vertebrates, larvae look
like lancelets. Most ancestral
extant vertebrates.
Cartilaginous skeleton
Swim bladder, operculum
Largest number of extant
fishes, calcified bone.
Rod-shaped bones in
pectoral and pelvic fins
Most ancestral, extant
tetrapods are amphibians,
still tied to water for jelly
eggs & larval form
(tadpoles), moist skin.
Egg is “self-contained pond,”
Water-proof skin: scales are
keratin-ized.
High degree of parental care.
1.
All life evolved in the __________.
1.
Oceans
2.
Name the first animal out of water?
2.
Crustaceans
3.
Name the first vertebrate out of water?
3.
lungfish
4.
Name the transitional organism between
water and land?
4.
amphibian
5.
reptiles
5.
Name the first group of animals that were
completely independent of water, even for
reproduction?
6.
monotreme
6.
Name the first mammal?
a. monotreme
b. marsupial
c. eutherian
Mrs. Loyd
cloyd@waukee.k12.ia.us
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