Dinosaurs
Dinosaurs are prehistoric reptiles that in the past dominated the Earth. Scientific dogma holds that they became extinct 65 million years ago, but this belief has been reassessed in recent years.
While real dinosaurs do appear in Transformers fiction, their most prominent presence is as the altmodes for some of the most dangerous (and occasionally ludicrous) Transformers of all time.
Fiction
Generation 1 animated continuity
Dinosaurs survived the mass extinction of 65 million years ago and lived on into the present on the time-displaced, and energy-rich, Dinobot Island.
The most prominent saurians in G1 were the Dinobots, five rebellious (yet extremely powerful) Autobots, who proved time and again a match for an army of Decepticons. Other dinosaur Transformers are Trypticon, Sky Lynx, and the cassette warriors, Slugfest and Overkill.
Marvel G1 Continuity
Dinosaurs survived in a part of the Antarctic known as the Savage Land.
Victory
The Dinoforce consisted of 6 Decepticons with sentient dinosaur Pretender shells and the ability to combine into Dinoking.
Beast Wars
Beast Wars featured two prominent dinosaur transformers, Dinobot (BW) (who was either a giant velociraptor or an average utahraptor), and Megatron (BW), whose orignal and Transmetal altmodes were that of a dwarf tyrannosaurus.
Terrorsaur transformed into a pteranodon, an extinct (non-dinosaur) reptile.
Beast Wars II
Gigastorm, Galvatron (BWII)'s younger brother took the form of a therapod dinosaur.
Beast Wars Neo
The Predacon lineup consisted of a number of dinosaurs, including Magmatron's components, Guiledart, Hardhead and Saberback.
Cybertron
One of Scourge's underlings, Undermine, transformes into a spinosaurus.
Animated
Grimlock and Slag are dinosaurs (a t-rex and a triceratops), while Swoop is a peterosaur.
