Encyclopedia

Aragosaurus: Profile of a Prehistoric Giant Aragosaurus Aragosaurus (ah-RAG-oh-SAWR-us; “Aragon lizard”) is a genus of sauropod dinosaur that lived during the Early Cretaceous period, about 130 to 125 million years ago. Its fossils were first discovered in the Aragon region of Spain, giving it its name. Aragosaurus was scientifically described in 1987 by a team […]

Aralosaurus Aralosaurus (AH-rah-loh-SAWR-us; “Aral Lizard” or “Lizard from the Aral Sea”) Aralosaurus is a genus of herbivorous hadrosaurid dinosaur that lived during the Late Cretaceous period, approximately 86 to 84 million years ago (during the Santonian stage), in what is now Kazakhstan. Its name, meaning “Aral lizard,” refers to the Aral Sea region, near where

Archaeoceratops: Profile of a Prehistoric Giant Archaeoceratops Archaeoceratops (AR-kee-oh-SEH-rah-tops; “Ancient horned face”) is a genus of small, early neoceratopsian dinosaur that lived during the Early Cretaceous period, approximately 125 to 122 million years ago. Its fossils have been discovered in the Mazongshan area of Gansu Province, north-central China. The name Archaeoceratops, meaning “ancient horned face,”

Archaeopteryx: The Ancient Winged Dinosaur Archaeopteryx Archaeopteryx (AR-kee-OP-tuh-riks; “ancient wing”) is a famous genus of bird-like dinosaur, often considered one of the earliest known birds. It lived during the Late Jurassic Period, about 150 million years ago, in what is now southern Germany. The name comes from the Greek words “archaios,” meaning ancient, and “pteryx,”

Archaeornithoides: The Tiny, Bird-Like Dinosaur of Ancient Mongolia Archaeornithoides Archaeornithoides (AR-kee-or-NITH-oy-deez; “Ancient bird-form”) is a genus of very small coelurosaurian theropod dinosaur that lived during the Late Cretaceous period, specifically the Campanian stage, about 75 million years ago. Its fossils were discovered in the Djadochta Formation of Mongolia. The name Archaeornithoides means “ancient bird-form,” highlighting

Archaeornithomimus: Profile of a Prehistoric Giant Archaeornithomimus Archaeornithomimus (AR-kee-or-NITH-oh-MY-mus; “Ancient bird mimic”) is a genus of ornithomimosaurian theropod dinosaur that lived during the Late Cretaceous period, approximately 97 to 70 million years ago. Its fossils have been primarily found in the Iriabune Formation of Inner Mongolia, China, with some possible remains also reported from Uzbekistan.

Arcovenator: Profile of a Prehistoric Giant Arcovenator Arcovenator (AR-ko-ven-AH-tor; “Arc hunter”) is a genus of abelisaurid theropod dinosaur, which means it was a meat-eating dinosaur that walked on two legs. It lived during the Late Cretaceous period, around 76 to 72 million years ago, in what is now southern France. The name Arcovenator means “Arc

Arctosaurus: Profile of a Mysterious Triassic Archosaur Arctosaurus About Arctosaurus Arctosaurus (ARK-toh-SAWR-us; “Arctic lizard” or “Bear lizard”) is a genus of archosaur, and possibly an early dinosaur, known from very limited fossil remains. These fossils date back to the Late Triassic period (Norian stage), about 228 to 208 million years ago. The remains were found

Arcusaurus: Profile of a Prehistoric Giant Arcusaurus Arcusaurus (AR-kuh-SAWR-us; “Rainbow lizard”) is a genus of basal sauropodomorph dinosaur that lived during the Early Jurassic period, approximately 200 to 190 million years ago, in what is now South Africa. The name Arcusaurus means “rainbow lizard,” derived from the Latin word ‘arcus’ (bow or rainbow) and the

Arenysaurus: Profile of a Prehistoric Giant Arenysaurus Arenysaurus (ah-REHN-ee-SAWR-us; “Arén lizard”) is a genus of hadrosaurid dinosaur, also known as a “duck-billed” dinosaur, that lived during the very end of the Late Cretaceous period, about 66 million years ago. Its fossils were discovered in the Arén region of Huesca, Spain, which is why it was