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