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Part 5 – Living on Land. From fish to (terrestrial) tetrapod. “fishes”. tetrapods. The Transition. Challenges of terrestrial living. Tetrapods. “Fishes”. The players …. Aquatic tetrapods. † Shallow water, freshwater aquatic tetrapod (lobe-finned fish) . Aquatic tetrapods.

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Presentation Transcript
slide1

Part 5 – Living on Land

From fish to (terrestrial) tetrapod

slide2

“fishes”

tetrapods

The Transition

slide4

Tetrapods

“Fishes”

slide9

Icthyostega

Internal choanae

slide17

1.

Amniotes(reptile/bird, mammal)

(Lepospondyli)

slide18

1.

† Primitive amniotes (pre- reptile/bird, mammal)

(Lepospondyli– husk vertebrae)

slide20

2.

Temnospondyli

Amphibians + (many) extinct things

slide21

2.

Temnospondyli

† Proto-Amphibians

(split vertebrae)

slide23

Amphibians

Amniotes

† aquatic tetrapods

† Temnospondyli

† semi-terrestrial tetrapods

† Lepospondyli

Terrestrial tetrapods

Tetrapods

slide24

lobe-fin fish

Amnoita

Class Amphibia

† various dead ends

† various dead ends

Lepospondyli

Temnospondyli

†various dead ends

terrestrial

aquatic

†early tetrapods

tetrapod

fish

slide25

Some time scale

6 billion years

slide26

Cenozoic

Mesozoic

Paleozoic

600 million years

slide27

Fish Events

Paleozoic

slide37

Meganeura

Carboniferous dragonfly

75 cm wingspan

slide40

Devonian – First tetrapods

Panderichthys

Tiktaalik

Acanthostega

Ichthyostega

slide41

Carboniferous –tetrapods diversify and move onto land

Pederpes

Loxomma

Amphibamus

Tuditanus

slide44

Pre-adaptations

Lungs

Limbs

slide45

Pre-adaptations

Internal choanae

slide47

Vertebral innovations

Terrestrial tetrapods

Fish

primitive (terrestrial) tetrapod

slide49

Vertebral Column

fishes, pre-terrestrial tetrapods

slide50

Vertebral Column

terrestrial tetrapods

slide53

Early Tetrapods

Aquatic

Terrestrial

slide55

*

Fishes

opercular bones present

pectoral girdle skull connected

slide56

Opercular bones lost

Lobe-finned Fish

Panderichthys

Basal tetrapod = “fish-o-pod”

Tiktaalik

slide59

“fish”

tetrapod

“fish”

tetrapod

slide60

Pelvic girdle

“Fishes”

No connection to vertebral column

slide61

Pelvic girdle

Lobefin fish

no connection

Primitive tetrapod

connection

slide62

Pectoral

Pelvic

Eryops

slide64

Pre-amphibians

Temnospondyli

slide66

Appendicular Skeleton

aquatic tetrapod

lobe-fin fish

slide67

Appendicular Skeleton

early terrestrial tetrapod

later terrestrial tetrapod

slide68

“fish”

tetrapod

“fish”

tetrapod

slide72

“Fish” – gills with lungs

Tetrapod – lungs with gills

slide76

lobe-fin fish

Lissamphibia = Class Amphibia (s.s.)

Amnoita

† various dead ends

† various dead ends

Lepospondyli

Temnospondyli

†various dead ends

terrestrial

aquatic

†early tetrapods

tetrapod

fish