Page 66 - Dinosaur (DK Eyewitness Books)

Classification of dinosaurs

EȢȤȩ ȬȪȯȥ Ȱȧ ȥȪȯȰȴȢȶȳ is called a species, and one or more
related species make up a genus (plural, genera). A species
together with all of its descendants forms a group called a clade.
A diagram made up of clades is known as a cladogram. Our
cladogram shows how most main groups of dinosaur were
related. For instance, the species Tyrannosaurus rex belongs
PIONEERS OF CLASSIFICATION
in the successively larger clades of Tyrannosaurus, tyrannosaurs, In 1735, Sweden’s Carl Linnaeus classified
coelurosaurs, tetanurans, theropods, and saurischians. living things into species and genera. In 1887,
Britain’s Harry Govier Seeley (above) classified
dinosaurs as ornithischians and saurischians.
In 1950, Germany’s Willi Hennig began
developing cladistics—the system of grouping
species and their descendants into clades.
Lesothosaurus
LESOTHOSAURS
Stegosaurus
THYREOPHORANS STEGOSAURS
ORNITHISCHIANS Ankylosaurus
ANKYLOSAURS
Camptosaurus

ORNITHOPODS
Pachycephalosaurus

CERAPODS PACHYCEPHALOSAURS

Triceratops
MARGINOCEPHALIANS
Plateosaurus

SAUROPODOMORPHS PROSAUROPODS CERATOPSIANS
Brachiosaurus
SAUROPODS
Coelophysis
DINOSAURS COELOPHYSOIDS
SAURISCHIANS Ceratosaurus CERATOSAURS

MANIRAPTORANS Deinonychus DROMAEOSAURS
Archaeopteryx
COELUROSAURS
BIRDS
THEROPODS
Tyrannosaurus rex

TYRANNOSAURS
Carcharodontosaurus
TETANURANS
CARNOSAURS
Herrerasaurus Spinosaurus

HERRERASAURS SPINOSAURS

TRIASSIC (250–200 mya) JURASSIC (200–145 mya) CRETACEOUS (145–65 mya)

64