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Dimetrodon (/ d aɪ ˈ m iː t r ə ˌ d ɒ n / ⓘ [1] or / d aɪ ˈ m ɛ t r ə ˌ d ɒ n /; [2] lit. ' two measures of teeth ') is an extinct genus of non-mammalian synapsid belonging to the family Sphenacodontidae that lived during the Cisuralian age of the Early Permian period, around 295–272 million years ago.
Megalania (Varanus priscus) is an extinct species of giant monitor lizard, [1] part of the megafaunal assemblage that inhabited Australia during the Pleistocene.It is the largest terrestrial lizard known to have existed, but the fragmentary nature of known remains make estimates highly uncertain.
Megalosaurus (meaning "great lizard", from Greek μέγας, megas, meaning 'big', 'tall' or 'great' and σαῦρος, sauros, meaning 'lizard') is an extinct genus of large carnivorous theropod dinosaurs of the Middle Jurassic Epoch (Bathonian stage, 166 million years ago) of southern England.
Styracosaurus (/ s t ɪ ˌ r æ k ə ˈ s ɔːr ə s / sti-RAK-ə-SOR-əs; meaning "spiked lizard" from the Ancient Greek styrax / στύραξ "spike at the butt-end of a spear-shaft" and sauros / σαῦρος "lizard") [1] is an extinct genus of herbivorous ceratopsian dinosaur from the Late Cretaceous (Campanian stage) of North America.
A 2016 estimate put the number of dinosaur species living in the Mesozoic at 1,543–2,468, [24] [25] compared to the number of modern-day birds (avian dinosaurs) at 10,806 species. [26] Extinct dinosaurs, as well as modern birds, include genera that are herbivorous and others carnivorous, including seed-eaters, fish-eaters, insectivores, and ...
Lystrosaurus (/ ˌ l ɪ s t r oʊ ˈ s ɔːr ə s /; 'shovel lizard'; proper Ancient Greek is λίστρον lístron ‘tool for leveling or smoothing, shovel, spade, hoe’) is an extinct genus of herbivorous dicynodont therapsids from the late Permian and Early Triassic epochs (around 248 million years ago).
Micropachycephalosaurus (meaning "small thick-headed lizard") is an extinct genus of basal marginocephalian dinosaur containing only the type species, Micropachycephalosaurus hongtuyanensis. It lived in China during the Late Cretaceous ( Campanian ) and was found in the Jiangjunding Formation .
Monolophosaurus (/ ˌ m ɒ n oʊ ˌ l ɒ f oʊ ˈ s ɔːr ə s / MON-oh-LOF-oh-SOR-əs; [1] meaning "single-crested lizard") is an extinct genus of tetanuran theropod dinosaur from the Middle Jurassic Shishugou Formation in what is now Xinjiang, China. [2] [3] It was named for the single crest on top of its skull.