Page 205 - The Dinosaur Book and Other Wonders of the Prehistoric World (DK-Smithsonian)

Spinosaurid
A large theropod dinosaur
that had crocodilelike jaws
for eating fish, named
after Spinosaurus.

Spore
A microscopic structure
produced, often in large
numbers, by plants (except Cretaceous Period and
seed plants), fungi, and many perhaps the Jurassic too.
microorganisms, from which Therizinosaurs were tall
a new individual can grow. with small heads, stumpy
Spores are usually spread feet, and pot bellies.
by wind or water.
Theropods
Stegosaurs A large branch of the
Plant-eating, quadrupedal dinosaur family tree made Dubreuillosaurus
dinosaurs with two tall rows up mostly of predators. was a horse-sized
of bony plates running down Theropods typically had theropod that lived
the neck, back, and tail. sharp teeth and claws. in the Jurassic Period.
They ranged from
Synapsids hen-sized creatures to the
A major vertebrate group, colossal Tyrannosaurus.
also known as “mammal-like especially large and have
reptiles,” that branched off Titanosaurs short arms with two-fingered
early in the evolution of Very large, four-legged, hands. Tyrannosaurus is
tetrapods, and eventually plant-eating dinosaurs. The the most famous member skeleton including a skull
gave rise to the mammals. titanosaurs were sauropods of the group. and a backbone. Fish,
and included perhaps the amphibians, reptiles,
Tentacle largest land animals ever. Tyrannosaurs birds, and mammals
A long, bendy, armlike body A group of related theropod are all vertebrates.
part that aquatic animals use Trackway dinosaurs that includes
for touching and grasping. A trail of fossilized tyrannosaurids and all Warm-blooded
dinosaur footprints. of their close relatives. Warm-blooded animals
Tetrapods maintain a constant internal
Vertebrates with four limbs Tundra Vertebrae body temperature, regardless
(arms, legs, or wings). All Treeless regions The bones that make up the of the external temperature.
amphibians, reptiles, mammals, dominated by low-growing, backbone of an animal such
and birds are tetrapods. cold-tolerant plants. as a dinosaur. Wingspan
The distance from the tip
Therizinosaurs Tyrannosaurids Vertebrates of one wing to the tip of
A group of unusual-looking A group of related Animals with an internal the other when both wings
dinosaurs that lived in the tyrannosaurs that are bony or cartilaginous are outstretched.

Fossils of this reptilelike
vertebrate, which lived 338
million years ago, were found
in West Lothian, Scotland.

US_200-203_Glossary.indd 203 20/06/2018 16:10