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E. Carboniferous (359-300 mya)
- inverts
Arthropleura -largest terrestrial arthropod - 2m
E. Carboniferous (359-300 mya)
- inverts
- radiation of insects
- evolution of flight
Meganeura monyi - largest insect ever
wingspan of 70 cm
E. Carboniferous (359-300 mya)
- inverts
- plants
The early Carboniferous saw a reduction in the Devonian forests and a dominance of small plants - lycopods and their kin.
Lepidodendron
Psaronius - fern
Lebachia - progymnosperm
Cordaites - progymnosperm
E. Carboniferous (359-300 mya)
- inverts
- plants
The early Carboniferous saw a reduction in the Devonian forests and a dominance of small plants - lycopods and their kin.
As the period proceeds, the giant lycopsid swamp forests evolve across the tropical continent of Euramerica.
There was lots of photosynthesis, but this was not balanced by decomposition (because much of the biomass was preserved in sediment, not broken down by decay). So, oxygen production by photosynthesis exceeded oxygen consumption by decomposition... and oxygen levels were probably very high...this may have allowed the enormous size of invertebrates.
E. Carboniferous (359-300 mya)
- inverts
- plants
E. Carboniferous (359-300 mya)
- inverts
- plants Coal deposits in shallow tropical swamps
E. Carboniferous (359-300 mya)
- inverts
- plants
- vertebrates
sharks replace placoderms as dominant in oceans;
The golden age of sharks - 45 Families
(currently 21)
E. Carboniferous (359-300 mya)
- inverts
- plants
- vertebrates
sharks replace placoderms as dominant in oceans;
ray finned fishes dominate in fresh water
- vertebrates
radiation of stem tetrapods!!
- vertebrates
radiation of stem tetrapods!!
- vertebrates
radiation of stem tetrapods!!
"Anthracosaurs"
E. Carboniferous (359-300 mya)
- inverts
- plants
- vertebrates
sharks replace placoderms as dominant in oceans;
ray finned fishes dominate in fresh water
stem tetrapods radiate!
"crown" tetrapods
Seymouriamorpha
Temnospondyls
Ichthyostegans
E. Carboniferous (359-300 mya)
- inverts
- plants
- vertebrates
stem tetrapods
Temnospondyls
a very diverse radiation of tetrapods, from alligator-like salamanders to large, scaled, frog-like creatures. Cowens places these ancestral to Amphibia only, but recent analyses put them as a sister clade to all crown tetrapods.
Temnospondyls
a very diverse radiation of tetrapods, from alligator-like salamanders to large, scaled, frog-like creatures. Cowens places these ancestral to Amphibia only, but recent analyses put them as a sister clade to all crown tetrapods.
Seymouriamorpha
Radiate in Permian
but earliest fossils from the Carboniferous... larvae have external gills, which pulls them out of the amniota...
- vertebrates
radiation of stem tetrapods!!
The Amniote Divide
The amniotic egg was a big advance
- amnion protects the embryo - yolk sac provides nourishment - allantoic sac holds waste produced by embryo
Resist desiccation
Provision embryo
allows for colonization of dry habitats
Primitive Amniotes
Hylonomus lyelli – an early reptile
Carboniferous of Nova Scotia
E. Carboniferous
- The Amniote Radiations
Anapsid ancestor
Hylonomus
Casineria
ANAPSID (turtles?)
DIAPSID
SYNAPSID
I. The Precambrian
- Vendian
II. Paleozoic
A. Cambrian (544-490 mya)
B. Ordovician (490-443 mya)
C. Silurian (443-417 mya)
D. Devonian (417-354 mya)
E. Carboniferous (359-300 mya)
F. Permian (300-251 mya)
F. Permian (300-251 mya)
Pangaea forms
The fusion of land masses reduced the amount of humid coastline and increased the extent of dry inland areas. This favored the amniote radiations over "amphibian" clades.
F. Permian
- The Amniote Radiations Diversify
Anapsid ancestor
Hylonomus
ANAPSID (turtles)
DIAPSID
SYNAPSID
F. Permian (300-251 mya)
Synapsids dominate through the early Permian
Mammals
Cynodonts
Gorgonopsids
Therapsids
Pelycosaurs
Dicynodonts
F. Permian (300-251 mya)
Pelycosaurs dominate early
include the great sail-finned animals like Dimetrodon
F. Permian (300-251 mya)
Early Therapsids, like Gorgonopsids, dominate in the mid-late Permian
Dinocephalians
Moschops
F. Permian (300-251 mya)
Dicynodonts come to numerical dominance in the late Permian
abundant herbivores
F. Permian (300-251 mya)
and the first Cynodonts appear
F. Permian (300-251 mya)
large herbivorous anapsids were also present
F. Permian (300-251 mya)
Diapsids were small and lizard-like; the Synapsids ruled terrestrial communities
F. Permian (300-251 mya)
- Plants!!
F. Permian (300-251 mya)
- Plants!!
- the dry climate reduced the great Carboniferous swamp forests; lycopods shrink...
- Ferns, and gymnosperms ("seed ferns", Ginkos, Cycads, and Conifers) gain prominence...
- In particular Glossopteris - a seed fern - that produces seeds on its leaves like sori of ferns...
The evolution of gymnosperms introduced two important adaptive features:
- pollen (male gametophyte) - no more swimming sperm; reduced reliance on open water habitats
- seed - protective seed coat reduced desiccation of embryo, and nutritious endosperm provisioned the embryo with energy. (Like the amniote egg).
F. Permian (300-251 mya)
The great Permian extinction!!!!
A huge mantle plume rises towards the surface...
F. Permian (300-251 mya)
The great Permian extinction!!!!
then it pops like a zit!!
F. Permian (300-251 mya)
The great Permian extinction!!!!
A huge mantle plume rises towards the surface...
resulting in a great bubble of flowing lava... the Siberian flats (200,000 squ. mi)
F. Permian (300-251 mya)
F. Permian (300-251 mya)
- results:
90-95% of marine species go extinct...
trilobites
placoderms
acanthodians
F. Permian (300-251 mya)
- results:
90-95% of marine species go extinct...
trilobites
placoderms
acanthodians
70% of all land families
pelycosaurs
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- climate:
Dry; low sea levels; one large supercontinent
beginning to break up
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- inverts:
- marine communities - gastropods and molluscs begin to dominate in these initially depauperate faunas... the 'modern marine fauna', including modern reef-builders
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Plants:
- recovery from the mass extinction is slow; lycopsids
dominate early, but soil formation is very slow...
- dry climate selects for seed plants with pollen;
the Gymnosperms...
Petrified Forest N. P.
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- Medium sized therapsids dominate early... like Lystrosaurus
Triassic survivors
Mammals
Gorgonopsids
Therapsids
Pelycosaurs
Dicynodonts
Cynodonts
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- Medium sized therapsids dominate early... like Lystrosaurus
- Temnospondyls resurgent (Mastodonosaurus - 6m)
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- radiation of the diapsids, but only Ichthyosaurs abundant early
Diapsida
Younginiformes
Ichthyosaurs
Lepidosaurs: Lizards, Snakes, Sphenodonts, Plesiosaurs)
Archosaurs: Dinosaurs, Pterosaurs, Crocodilians, Birds
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- the opening of the shallow Tethys Sea between Laurasia and Gondwanaland created a very productive marine environment, which was exploited by a diverse group of evolving marine reptiles:
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- marine reptiles:
Ichthyosaurs
Placodonts
Archeosaurs:
Tanystropheus
Lepidosaurs:
Nothosaurus
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- marine reptiles:
Lepidosaurs:
Nothosaurus
Shonisaurus - 45m largest reptile
(Blue Whale = 33m, 110 ft)
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
Crocodylomorphs
(Ornithosuchans and Phytosaurs)
Pterosaurs
Dinosaurs
crucrotarsi
Ornithodira
(Marasuchas)
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- Crocodylomorphs:
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- In the late Triassic, the first Dinosaur radiations occur.
Ornithichians
Prosauropods
Sauropods
Theropods
Saurichians
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- In the late Triassic, the first Dinosaur radiations occur.
Ornithichians
Prosauropods
Sauropods
Theropods
Ornithischians
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- In the late Triassic, the first Dinosaur radiations occur.
Ornithichians
Prosauropods
Sauropods
Theropods
Saurischians
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- In the late Triassic, the first Dinosaur radiations occur.
Oldest Dinosaurs are the Theropod-like Eoraptor
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- As the Triassic proceeds, the Archosaurs displace the Therapsids.
- In the late Triassic, the first Dinosaur radiations occur.
The first radiation of large dinosaurs were the herbivorous Prosauropods
By the late Triassic, all large herbivores were Sauropodomorphs.
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
- Verts:
- the first mammaliforms... Morganucodontids
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Climate:
A global greenhouse - lush tropical habitats and rich shallow seas lead to the period of maximum Dinosaur domination.
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Marine Reptiles:
Ichthyosaurs still present...
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Marine Reptiles:
but now joined by Plesiosaurs and Pliosaurs (both Lepidosaurs)
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Marine Reptiles:
and marine crocodylians....
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Herbivores:
Ornithichian Stegosaurs
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Herbivores:
Sauropods - the first of the real giants
1, small head and peg-like teeth (and elongated cervical vertebrae)
2, addition of extra cervical vertebrae to the neck
3, apron-like pubis
4, fore limbs as long as or longer than hind limbs, making the back slope posteriorly
5, teeth restricted to front of mouth 6, armor.
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Herbivores:
Sauropods - the first of the real giants
Ultrasaurus (maybe a Brachiosaurus) stood 98 ft long, 140 tons
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Herbivores:
Sauropods - the first of the real giants
Diplodocus - 90 ft long 11 tons
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Carnivores:
1. three-toed foot2. digits IV and V lost on hand3. long arms4. semilunate carpal5. fused pelvis6. large hole in lacrimal bone in skull7. ?no unique derived characters?8. giant, hook-like claw on digit II of pes9. flight feathers
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Carnivores:
- Ceratosaurs
Ceratosaurus
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Carnivores:
- Carnosaurs Allosaurus
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Carnivores:
- Avialae Archaeopteryx
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Carnivores:
- Avialae Archaeopteryx
First fossil - 1860 - a flight feather (asymmetrical)
The 'London' Specimen - 1861 The 'Berlin' Specimen - 1877
10th specimen described in 2005 - shows intermediately rotated halux
10th specimen described in 2005 - shows intermediately rotated halux and hyperextended 2nd digit (like Deinonychosaurs - their sister clade)
10th specimen described in 2005 - shows intermediately rotated halux and hyperextended 2nd digit (like Deinonychosaurs - their sister clade)
A. Herrerasaurus- five digits are present, Digit V shaded yellow and hidden on other side of hand.
B. Coelophysis. Note that digit V is gone.
C. Deinonychus. Note loss of both digits V and IV
D. Archaeopteryx. Note very close correspondence in proportions and relative lengths of bones to Deinonychus.
E. Hoatzin embryo. Number of bones reduced in digit III.
F. Hoatzin adult. Most of the bones of the hand fused
Hand Morphology
Ornitholestes(theropod dinosaur)
Archaeopteryx
Sinornis(a Cretaceous bird)
Modern chicken
Another Set of Examples
Archaeopteryx
Chicken
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Pterosaurs
They were present in the Triassic, but reached their greatest diversity in the Jurassic, with over 80 species recorded.
However, they would attain their greatest size in the Cretaceous.
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Pterosaurs
They were present in the Triassic, but reached their greatest diversity in the Jurassic, with over 80 species recorded.
However, they would attain their greatest size in the Cretaceous.
III. Mesozoic Era
B. Jurassic (200-146 mya)
- Mammals:
Docodonts.... a group of beaver-like animals... the most impressive fossil of the group was found in Feb 2006
- oldest animal with fur
- demonstrates that mammals were radiating into a variety of habitats
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (145 - 65 mya)
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- the warming trend of the Jurassic continues, and results in very high sea levels and the expanse of shallow seas over significant portions of continents
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- Plants:
Evolution of Angiosperms
Initially in low abundance
Come to dominate by end of Cretaceous
Gymnosperms
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- Plants:
Evolution of Angiosperms
Initially in low abundance
Come to dominate by end of Cretaceous
Gymnosperms
Angiosperms
Archaefructus sinensis
Science 2002
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- Plants:
Evolution of Angiosperms
Initially in low abundance
Come to dominate by end of Cretaceous
Gymnosperms
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- Plants:
Evolution of Angiosperms
Initially in low abundance
Come to dominate by end of Cretaceous
Gymnosperms
III. Mesozoic Era
A. Triassic Period (250 - 205 mya)
B. Jurassic (205 - 146 mya)
C. Cretaceous (146 - 65 mya)
- Inverts:
radiation of pollinators
radiation of pollinators and herbivores
ground beetles do not
C. Cretaceous
- Verts:
-Crocodylians
Sarcosuchus
11m
C. Cretaceous (146 - 65 mya)
- Inverts:
- Verts:
Ornithischians:
Stegosaurs give way to a variety of new
Ornithischian groups:
Ornithischians:
Ankylosaurs
Ornithischians:
Ceratopsians
Ornithischians:
Iguanodonts
Ornithischians:
Hadrosaurs
Ornithischians:
Pachycephalosaurs
C. Cretaceous (146 - 65 mya)
- Inverts:
- Verts:
Ornithischians:
Saurischians - Sauropods
The Titanosaurs (and they were still big)
The Titanosaurs
Andesaurus
40m (?) 80 tons (?)
incomplete skeleton
The Titanosaurs
Argentinasaurus
Largest one known with confidence, but there are bigger single bones....
35m 80-100 tons
incomplete skeleton but a hip girdle, vertebrae, and tibia
C. Cretaceous
- Theropods: carnivores get big!!
Carnosaurs
- Giant Allosaur cousins like:
Giganotosaurus
Longer than the largest Tyrannosaurus rex by 2m
40-45 ft... from Argentina (1995)
C. Cretaceous
Carnosaurs
- Giant Allosaur cousins like:
Carcharodontosaurus
40 ft - slightly smaller than T. rex
from Niger (1927)
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Albertosaurus
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Gorgosaurus
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Tyrannosaurus (3 sp.)
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Tyrannosaurus (3 sp.)
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Tyrannosaurus (3 sp.)
Soft tissue from a femur?. 2005
C. Cretaceous
Carnosaurs
- Tyrannosaurs:
- Dilong paradoxicus
Feathered
C. Cretaceous
- Deinonychians
Deinonychus
Velaciraptor
III. Mesozoic
C. Cretaceous
- theropods (still)
- Deinonychians
Velociraptor
C. Cretaceous
- non-bird feathered dinosaurs: Sinosauropteryx prima (1996)
first non-bird dinosaur with feathers... a Cretaceous contemporary of birds
- Protobirds
- Protobirds: Sinornithosaurus (Jurassic)
- Protobirds: Microraptor (Cretaceous)
Protobirds:
- Deinonychians
Velociraptor
- Protobirds: Unenlagia (Cretaceous)
- Protobirds: Caudipterxy (Cretaceous)
- Protobirds: Protarchaeopteryx (Cretaceous)
- Protobirds: Eoalulavis (Cretaceous)
- Pterosaurs:
- Pterosaurs:
Pteranodon - wingspan 7.5 m
- Pterosaurs:
Quetzalcoatlus - largest ptersaur; 40 ft wingspan....
- Quetzalcoatlus - largest flying animal
Quetzalcoatlus - largest ptersaur; 40 ft wingspan....
- Mammals...
- Mammals...
- Multituberculates Dominate in Cretaceous
- over 200 species
The K-T Boundary
The K-T Boundary
hmm... a new star in the constellation of Orion...
THAT'S weird...
The K-T Boundary
The K-T Boundary
WHAT THE HELL!!!
It's the Ceratopsians... they're attacking...!!!
The K-T Boundary
The K-T Boundary
The K-T Boundary
The K-T Boundary