Agathaumas (AG-ah-THAW-mus; “Great Wonder”) is a genus of large ceratopsian dinosaur from the Late Cretaceous Period, living approximately 66 million years ago in what is now Wyoming, USA. The name was given by paleontologist Edward Drinker Cope in 1872, based on very large but incomplete fossil remains discovered earlier that year by Fielding Bradford Meek […]
Agilisaurus (AJ-ih-lih-SAWR-us; “Agile lizard”) is a genus of small, plant-eating ornithischian dinosaur that lived during the Middle Jurassic period, approximately 168 to 161 million years ago. Its fossils were discovered in what is now Sichuan Province, China. The dinosaur was named by paleontologist Peng Guangzhao in 1990. The name Agilisaurus was chosen because its light
Agnosphitys (ag-NOS-fih-tiss; “unknown lineage”) is a genus of archosaur, possibly an early dinosaur or a close relative, that lived during the Late Triassic period, around 205 to 200 million years ago. Its fossils were discovered in Somerset, England. The name Agnosphitys refers to the uncertainty paleontologists have had about its exact place in the reptile
Agrosaurus (AG-roh-SAWR-us; “field lizard”) is a genus of herbivorous dinosaur whose classification has been a subject of much scientific debate. Originally thought to have lived during the Early Jurassic period in Australia, the fossils attributed to Agrosaurus are now believed by many paleontologists to have come from England and likely belong to a different, already
Agujaceratops (ah-GOO-hah-SEH-rah-tops; “Agua horn-face”) is a genus of chasmosaurine ceratopsid dinosaur that lived during the Late Cretaceous period, approximately 77 million years ago. Its fossils were discovered in the Aguja Formation in Texas, USA, which is how it got its name. Agujaceratops was first identified as a distinct genus in 2006 by paleontologists Spencer G.
Agustinia (ah-gus-TEEN-ee-uh; “Agustin’s lizard”) is a genus of sauropod dinosaur that lived during the Early Cretaceous period, about 116 to 100 million years ago, in what is now Patagonia, Argentina, South America. The name honors Agustin Martinelli, who discovered its fossils. Agustinia was first named and described by paleontologist José Bonaparte in 1999, initially as
