Chapter 34
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Transcript of Chapter 34
![Page 1: Chapter 34](https://reader036.fdocuments.us/reader036/viewer/2022062405/556180e1d8b42a98268b5481/html5/thumbnails/1.jpg)
Chapter 34b:Vertebrates(mammals)
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Mam
mal
iaThough mammals
predate the dinosaurs, it was only once the
dinosaurs were mostly gone that the mammal
adaptive radiation began in earnest
The defining features of extant mammals are their
hair, mammary glands, larger brains,
differentiated teeth, modified jaws, etc.
The mammal lineage
predates the mammals with the
synapsids: the mammal-like reptiles
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Mam
mal
s: M
onot
rem
es
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Mon
otre
me:
Ech
idna
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Mon
otre
me:
Pla
typu
s
Duck-billed platypuses are aquatic so keep their eggs
warm in burrows until hatching
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Mam
mal
s: M
arsu
pial
s
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Exam
ples
of M
arsu
pial
s
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Mam
mal
s: E
uthe
rians
Eutherians are the placental mammals, i.e., the majority of
mammals are eutherians
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Mam
mal
s: P
rimat
es
The primates inhabit a branch of the mammalian phylogeny also occupied by the rodents
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Ord
er P
rimat
esThe
anthropoids include the monkeys, the apes,
and us
Variety of
primate hands
Prosimians
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Prim
ates
Primates possess numerous adaptations that allow rapid movement through trees
• Remember all the characteristics of primates we talked about! (AND DISTINGUISH THEM FROM HUMAN CHARACTERISTICS)
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Pros
imia
n: A
Lem
ur
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Monkeys are Anthropoids
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Ord
er P
rimat
es
The hominoids include the apes and us
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Known or Suspect Hominids
Hominids (by your text) are more closely morphologically similar to us than they are to
chimpanzees
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Sim
plifi
ed T
ree
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Aust
ralo
pith
icus
afa
rens
is
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Hom
o ha
bilis
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Hom
o er
ectu
s H. erectus lived from approximately 1.8 to 0.5
million years ago and perhaps even longer H. erectus was the most successful of the the
genus Homo lineages in terms of time on Earth H. erectus spread her kind throughout the old
world
![Page 21: Chapter 34](https://reader036.fdocuments.us/reader036/viewer/2022062405/556180e1d8b42a98268b5481/html5/thumbnails/21.jpg)
Pan H. erectus
H. sapiensHomo
Hom
o er
ectu
s