Encyclopedia

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,” […]

“`html 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,”

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.

“`html 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

“`html 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

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

“`html 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

“`html Argentinosaurus: Profile of a Prehistoric Giant Argentinosaurus Argentinosaurus (ar-jen-TEEN-oh-SAWR-us; “Argentine lizard”) is a genus of giant titanosaurian sauropod dinosaur that lived during the Late Cretaceous period, approximately 97 to 93.5 million years ago. Its fossils were discovered in what is now the Neuquén Province of Argentina, South America. The name Argentinosaurus honors the country

Argyrosaurus: Profile of a Prehistoric Giant Argyrosaurus Argyrosaurus (AR-ji-roh-SAWR-us; “Silver lizard”) is a genus of giant titanosaurian sauropod dinosaur that lived during the Late Cretaceous period, approximately 85 to 70 million years ago, in what is now Argentina, South America. The name was given by British paleontologist Richard Lydekker in 1893 and means “silver lizard,”

“`html Aristosaurus: Profile of a Prehistoric Giant Aristosaurus Aristosaurus (ah-RIS-toh-SAWR-us; “Noble Lizard”) is a genus of small ornithopod dinosaur that lived during the Early Cretaceous period, approximately 125 million years ago, in what is now Europe. The name comes from the Greek words “aristos,” meaning “noble” or “best,” and “sauros,” meaning “lizard,” perhaps reflecting the