Acanthopholis (/”uh-KAN-tho-FOE-liss”/; “spine-bearing scale” or “thorny scale”) is a genus of nodosaurid ankylosaurian dinosaur that lived during the Late Cretaceous period (Cenomanian stage), approximately 100.5 to 93.9 million years ago. Its fossils have been discovered primarily in England. The name Acanthopholis refers to the bony armor, including spikes and plates, that covered its body. The genus […]
Achelousaurus (uh-KEE-loh-SAWR-us; “Achelous’ lizard”) is a genus of centrosaurine ceratopsian dinosaur that lived during the Late Cretaceous period, approximately 74.2 million years ago (late Campanian stage), in what is now Montana, North America. The name refers to the Greek mythological figure Achelous, a river god who could change his shape and had one of his
Achillesaurus (Uh-KILL-ee-SAWR-us; “Achilles’ lizard”) is a genus of alvarezsaurid theropod dinosaur that lived during the Late Cretaceous period (Santonian stage), approximately 86.3 to 83.6 million years ago. Its fossils were discovered in the Bajo de la Carpa Formation in Río Negro Province, Argentina. The name Achillesaurus refers to the dinosaur’s well-developed heel bone, which suggests
Achillobator (/uh-KILL-oh-BAY-tor/; “Achilles hero” or “Achilles warrior”) is a genus of large dromaeosaurid theropod dinosaur that lived during the Late Cretaceous period, approximately 96 to 89 million years ago, in what is now Mongolia. The name refers to the powerful Achilles tendon that would have attached to its heel, hinting at its strong leg muscles,
Acristavus (/”a-KRIS-tah-vus”/; “uncrested grandfather”) is a genus of hadrosaurid dinosaur that lived during the Late Cretaceous period, approximately 80 to 78 million years ago, in what is now North America. The first fossils of Acristavus were discovered in Montana and Utah, and the dinosaur was scientifically described in 2011. The name Acristavus comes from the
Acrocanthosaurus (/”AK-ro-KAN-tho-SAWR-us”/; “high-spined lizard”) is a genus of very large, meat-eating dinosaur. It belonged to a group called carcharodontosaurid theropods and lived during the Early Cretaceous period, approximately 113 to 110 million years ago. Fossils of Acrocanthosaurus have been discovered mainly in North America, in states like Oklahoma, Texas, and Wyoming. The name Acrocanthosaurus comes
Acrotholus (/”AK-roh-THO-luss”/; “highest dome”) is a genus of pachycephalosaurid dinosaur that lived during the Late Cretaceous period. Its fossils date to the Santonian stage, approximately 85.8 to 83.5 million years ago. These remains were discovered in the Milk River Formation of Alberta, Canada. The genus was scientifically described in 2013 by paleontologists David C. Evans,
