Dinosaurs That Start With R

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Explore a complete list of over 30 dinosaurs that start with the letter R.

Each dinosaur listed has a dedicated page with information on classification, diet, size, fossil evidence, geographic distribution, and maps of known fossil locations, where available. Pages may also include size comparison charts, fossil representations, and in-depth descriptions based on current scientific research.

The amount of information varies by species, depending on the completeness of fossil discoveries.

Rahiolisaurus

Diet: ‭C‬arnivore.Size: Roughly estimated to be around ‬8‭ ‬meters long.Time Period: Maastrichtian of the Cretaceous.
Rahonavis

Rahonavis

Diet: Carnivore.Size: 70‭ ‬centimeters long.Time Period: Maastrichtian of the Cretaceous.

Rajasaurus

Diet: Carnivore.Size: ‬Skull is‭ ‬60‭ ‬centimetres long. Body length estimates vary greatly, and range from 6 to 9 meters.Time Period: Maastrichtian of the Cretaceous.

Rapator

Diet: Carnivore.Size: Roughly estimated at up to‭ ‬9‭ ‬meters long.Time Period: Aptian of the Cretaceous.

Rapaxavis

Diet: Unavailable.Size: Unavailable.Time Period: Early Cretaceous.
Rapetosaurus

Rapetosaurus

Diet: Herbivore.Size: Possibly up‭ ‬to‭ ‬15‭ ‬meters long.Time Period: Maastrichtian of the Cretaceous.

Raptorex

Diet: Carnivore.Size: About‭ ‬2.5‭ ‬meters long for holotype.Time Period: Uncertain,‭ ‬but probably Campanian.

Ratchasimasaurus

Diet: Herbivore.Size: Unknown.Time Period: Aptian of the Cretaceous.

Rativates

Diet: Omnivore‭?Size: Roughly about‭ ‬3.2/3.3‭ ‬meters long for the holotype which was an almost fully grown adult.Time Period: Campanian of the Cretaceous.

Rayososaurus

Diet: Herbivore.Size: Uncertain,‭ ‬but very roughly estimated to be about‭ ‬6‭ ‬meters long.Time Period: Cenomanian of the Cretaceous.
Rebbachisaurus

Rebbachisaurus

Diet: Herbivore.Size: ‭U‬p to about‭ ‬20‭ ‬meters long.Time Period: Cenomanian of the Cretaceous.

Regaliceratops

Diet: Herbivore.Size: Roughly about‭ ‬5‭ ‬meters long.Time Period: Middle Maastrichtian of the Cretaceous.

Regnosaurus

Diet: Herbivore.Size: In the past estimated about‭ ‬4‭ ‬meters long,‭ ‬but given the severe lack of fossils this is highly speculative.Time Period: Early Cretaceous.

Rhabdodon

Diet: Herbivore.Size: Four a long time thought to be about 4 meters long, further discoveries indicate that adults actually ranged between 4 and 6 meters in length.Time Period: ‭L‬ate Campanian to Early Maastrichtian of the Cretaceous.

Rhinorex

Diet: Herbivore.Size: Holotype skull about‭ ‬78‭ ‬centimetres long.‭ ‬Total body length‭ ‬roughly estimated to be about‭ ‬9‭ ‬meters long.Time Period: Campanian of the Cretaceous.
Rhoetosaurus

Rhoetosaurus

Diet: Herbivore.Size: Estimated 12-15 meters long.Time Period: Oxfordian of the Jurassic.

Rhomaleopakhus

Diet: Herbivore.Size: Unknown due to lack of remains.Time Period: Late Jurassic.

Riabininohadros

Diet: Herbivore.Size: Uncertain due to lack of remains.Time Period: Maastrichtian of the Cretaceous.

Richardoestesia

Diet: Carnivore.Size: Unknown due to lack of fossil material.Time Period: Campanian of the Cretaceous‭ (‬possibly earlier to the Barremian‭)‬.

Rinchenia

Diet: Uncertain.Size: About‭ ‬1.5‭ ‬meters long.Time Period: Late Cretaceous.

Rinconsaurus

Diet: Herbivore.Size: Estimated about‭ ‬11‭ ‬meters long.Time Period: Turonian to Coniacian of the Cretaceous.

Riojasaurus

Diet: Herbivore.Size: About‭ ‬10‭ ‬meters long.Time Period: Norian of the Triassic.

Riparovenator

Diet: Piscivore/Carnivore.Size: Uncertain due to lack of remains but roughly estimated to have been about‭ ‬8.5‭ ‬meters long.Time Period: Barremian of the Cretaceous.

Rocasaurus

Diet: Herbivore.Size: About‭ ‬8‭ ‬meters long,‭ ‬possibly larger.Time Period: Campanian of the Cretaceous.

Rubeosaurus

Diet: Herbivore.Size: Unknown due to lack of remains.Time Period: Campanian of the Cretaceous.