Page 204 - The Dinosaur Book and Other Wonders of the Prehistoric World (DK-Smithsonian)

Glossary Pterosaurs
Flying reptiles that
lived during the age of
dinosaurs. The wings
of pterosaurs consisted of
sheets of skin stretched
between the limbs. Some
Mosasaurs Oviraptorosaur pterosaurs were huge.
Giant, sea-dwelling lizards A theropod dinosaur
that lived during the with a beak and Quadrupedal
Cretaceous Period. They feathered arms, Walking on four legs. Most
were fierce predators with named after mammals and reptiles
slender bodies, long snouts, Oviraptor. are quadrupedal.
and flipperlike limbs.
Pachycephalosaurs Rachis
Omnivore A group of related The central, hollow shaft
An animal that eats both bipedal dinosaurs with of a feather.
plant and animal food. thickened, domelike
Examples include pigs, skulls. Ray-finned fish
rats, and human beings. A major group of bony
Paleontologist fish that includes about
Ornithomimosaurs A scientist who studies the Eosimias, a tiny prehistoric 25,000 of today’s fish
Birdlike dinosaurs that were fossil remains of plants and primate, was only about species and many prehistoric
built like ostriches. They animals. 2 in (5 cm) long. species. Ray-finned fish
were the fastest animals on have fins consisting of
land in the Cretaceous Period. Palps skin stretched over a fan
A pair of segmented, armlike of thin bones.
structures in the mouthparts Predator
of some invertebrates, such An animal that hunts and kills Reptile
as spiders and scorpions. other animals for food. Modern reptiles are
Also called pedipalps. cold-blooded animals with
Prey scaly skin and that typically
An animal that is killed and reproduce by laying eggs.
eaten by another animal. Lizards, snakes, turtles,
and crocodiles are reptiles.
Primates Dinosaurs and their relatives
A group of related are reptiles too, but were
mammals that includes very different from
lemurs, monkeys, apes, living kinds.
and human beings.
Sauropods
Primitive Gigantic, long-necked,
At an early stage plant-eating dinosaurs.
of evolution. The sauropods lived through
most of the Mesozoic Era.

This is the skeleton Scutes
of a juvenile male Bony plates with a
mammoth. horny covering set
Prosauropods in the skin of certain
A group of related reptiles to protect them
Plesiosaurs plant-eating dinosaurs from predators.
Large, prehistoric marine that lived in the Triassic
reptiles that swam with and Jurassic. Prosauropods Sedimentary rock
flipper-shaped limbs. Many were the ancestors The type of rock in which
had enormously long necks of sauropods. fossils are found.
and tiny heads.
Protofeathers Species
Pliosaurs Hairlike structures A group of similar
Short-necked plesiosaurs that that provided insulation organisms that can
had large heads and powerful, and later evolved breed with one another
202 toothed jaws. into feathers. to produce offspring.

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