mesozoic mammals: in the shadows of dinosaurs mammals: in the shadows of dinosaurs i. review a....

Mes

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amm

als:

in th

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osau

rsI.

REV

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A.

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volu

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mal

ian

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volu

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of

Mam

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s

III.

Mys

terie

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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

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Adv

ance

d,

mam

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Mam

mal

Prim

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apsi

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70 s

q. m