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Wanted: Oscar Obsidian - Auckland Museum

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Background<br />

Other dinosaurs fossils indicate the existence of<br />

agile ornithopod dinosaurs and large<br />

four-footed sauropods.<br />

Theropod Dinosaurs<br />

Theropods were agile<br />

predators that walked<br />

upright on strong hind<br />

legs, had short front<br />

legs and large heads<br />

with sharp teeth.<br />

Tyrannosaurus and<br />

Allosaurus were<br />

theropods. The cast<br />

on display is of<br />

Cryolophosaurus, an<br />

Antarctic dinosaur.<br />

One small species of<br />

theropods evolved into the<br />

first birds around 150 million<br />

years ago.<br />

Sauropod Dinosaurs<br />

Sauropods were large four footed dinosaurs with<br />

long necks and tails. They were herbivores which<br />

probably lived in herds. A fragment of rib bone<br />

has been found in New Zealand.<br />

Ornithopod Dinosaurs<br />

Ornithopod dinosaurs were bird-hipped dinosaurs<br />

which were herbivorous and walked exclusively on<br />

their back legs. Part of a pelvis has been found<br />

in New Zealand.<br />

Icthyosaur fossil.<br />

Cryolophosaurus.<br />

<strong>Auckland</strong> <strong>Museum</strong> 17<br />

Pterosaurs<br />

Pterosaurs were flying reptiles, not<br />

dinosaurs. They had bat-like wings<br />

formed by a membrane of skin,<br />

although only the fourth finger<br />

was elongated to support<br />

the wing whereas<br />

all four fingers in bats<br />

are elongated. Two<br />

small bones have<br />

been found in New<br />

Zealand.<br />

Marine Reptiles -<br />

Mosasaurs, Plesiosaurs<br />

and Icthyosaurs<br />

Mosasaurs were giant<br />

marine lizards similar to<br />

Komodo dragons. At least<br />

five species were known in New<br />

Zealand. Mosasaurs were predators<br />

that grew as long as 12 metres.<br />

Plesiosaurs were predators with small heads,<br />

sharp teeth and limbs which were paddle-shaped.<br />

Some grew to 13metres long. Elasmosaurs were<br />

long-necked forms, while Pliosaurs were shortnecked<br />

forms. The plesiosaur fossil on display<br />

was removed recently from the Kaikoura region.<br />

Icthyosaurs were fast-swimming marine predators<br />

like dolphins (although dolphins are mammals).<br />

They probably fed on squid-like belemnites.

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