Mes
ozoi
c M
amm
als:
in th
e sh
adow
s of
din
osau
rsI.
REV
IEW
A.
Ear
th’s
Orig
ins
B.
Geo
logi
cal T
ime
Sca
le
C.
Pla
te T
ecto
nics
D.
Evo
lutio
n of
Life
E.
Inva
sion
s of
the
Land
F. E
volu
tiona
ry T
hem
esII.
EVO
LUTI
ON
OF
MES
OZO
IC
REP
TILE
SA
. H
omeo
stas
is,
Hom
eoth
erm
y an
d E
ndot
herm
yB
. E
volu
tiona
ry T
imel
ine
and
Mys
terie
s of
the
Mes
ozoi
cC
. C
ham
pion
s of
Cop
e’s
Rul
eD
. Fi
ne F
eath
ered
Run
ners
E.
Cre
atur
es o
f the
Dar
kF.
Phy
loge
ny o
f Rep
tilia
n
Mam
mal
ian
Line
age
G.
Sym
phon
ic E
volu
tion
of
Mam
mal
s
III.
Mys
terie
s of
the
Mes
ozoi
c R
evis
ited
Evolutionary Adaptations to Dry LandAmniotes – common ancestor of reptiles, birds, mammals
? Diphyletic (polyphyletic) origin of mammals (?) Earliest Reptiles ~ 325 my bpEarliest Mammals 220 – 240 mybp
65
Anapsida
Diapsida
Euryapsida
Synapsida
“Reptile”lineages
“Mammal” lineages
Amniota
Orders
?
Time (my)350 248 144
-- -- -- -- - Paleozoic Era) ( Mesozoic Era )
A – Stratum germinativumB – erector muscleC – Sebaceous glandD – HairE – Epidermis layerF – Dermis layerG – Subcutaneous layerH – Adipose tissueI - Arteriole, venuoleJ – Sweat glandK – Hair follicleL – Nerve receptor(Meissner’s – touch; Pacinian – pressure)
Pely
cosa
ur
Adv
ance
d,
mam
mal
-lik
e re
ptile
Mam
mal
Prim
itive
ther
apsi
d
70 s
q. m