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🦕 (Unique body plan helps identify dinosaurs from other animals, Lizard…
🦕
Unique body plan helps identify dinosaurs from other animals
Limbs ere held vertically beneath the body
A sharply-interned neck and a ball-shaped head
=> Fully open acetabulum or hip socket
A supra-acetabular crest => Prevent dislocation of the femur
Knee jount aligned below the actebulum => Hind linb can swing backwards and forwards
Lizard and dinosaur-
two distinct superorders
In the same class Reptillia
Animal with backbones
have significant differences: Two Different superorders
Lepidosauria or Lepidosaurs
Archosauria or Archosaurs
The origins of dinosaurs and lizards
Lizards, snakes and different types of thecondont
Lepidosaurs, eosuchians and their prehistoric ancestors
In later years of the Triassic Period(c. 248-208 million years ago)
Dinasaurs, pterosaur, extincted thecondonts, modern crocodiles
Archosaurs, or "rulling reptiles"
Earlier in the Triassic Period
Skull bones distinguish dinosaurs from other archosaurs
Great ranges of shapes and sizes
Have vomers extended on either side of the head
The suborders of Saurischia
Divided into two suborders
therapoda or Therapods
"beast feet", bipedal, predatory carnivores
Ranged in size
Sauropodomorpha or Sauropodomorphs
Lizard feet forms
included both bedepal and quadrupedal 🦕
Included some of the largest and best-known of all dinosaurs
Classification according to pelvic anatomy
Dinosaurs are divieded into 2 orders
Saurischia
Pubis points forward
Ornithischia
Pubis points backwards towards the rear of the animal
The suboreders of Ornithischian
Divided into 3 suborder
Orinithipoda
Bird feet
Could walk and run on their long hind legs, balanceing their body by holding their tails stiffly off the ground behind them
Thyreophorans
Shield bearers
Armoured dinosaurs, were quadrupeds with row of protective body spikes, studs or plates along their backs and tails
Marginocephalians
Margined head
bepedal or quadrupedal ornithischians with a deep bony frill or narrow shelf at the back of the skull