At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Primary habitat Warm epicontinental seas — open marine Known fossil locations Netherlands, Belgium, Morocco, Russia, North America Water type Marine (saltwater) — freshwater capability debated Terrestrial capability None — fully aquatic Quick Answer: Mosasaurus habitat was the warm, shallow … Read more
At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Class Reptilia Order Squamata — lizards and snakes Closest living relatives Monitor lizards (Varanidae) — Tier 3 comparative inference Dinosaur? No — different reptile lineage entirely Quick Answer: Mosasaurus is not a dinosaur. It was a mosasaurid — a … Read more
At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Discovery location St Pietersberg chalk quarry, Maastricht, Netherlands Initial discovery date c.1770s — exact year disputed; skull described formally by 1786 Named by William Daniel Conybeare, 1822 — genus name established Specimen status Holotype skull held at Muséum National … Read more
At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Tooth type Conical, recurved, pleurodont attachment Jaw feature Double-hinged lower jaw — intramandibular joint directly evidenced Tail structure Hypocercal tail fluke — directly evidenced by fossil skin impressions Quick Answer: Mosasaurus teeth were conical and slightly recurved, anchored in … Read more
At a Glance Feature Mosasaurus hoffmannii Otodus megalodon Classification Squamata, Mosasauridae Chondrichthyes, Otodontidae Period Late Cretaceous, 82–66 Ma Miocene–Pliocene, 23–3.6 Ma Estimated length 13–14 m (43–46 ft) 15–20 m (49–66 ft) — range disputed Estimated mass likely in the range of 14,000–15,000 kg (30,900–33,100 lb) 30,000–65,000 kg (66,000–143,000 lb) — estimates vary widely Bite force … Read more
At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Diet type Carnivore — apex marine predator Direct evidence from mosasaurids (including closely related taxa) shows Fish, cephalopods, marine reptiles — documented via tooth marks and mosasaurid fossils Trophic position Top predator in Late Cretaceous marine ecosystems Quick Answer: … Read more
At a Glance Field Information Species Mosasaurus hoffmannii — Squamata, Mosasauridae Period Late Cretaceous, 82–66 Ma Maximum recorded length ~13–14 m (43–46 ft) — based on largest known specimens Mass estimate likely in the range of 14,000–15,000 kg (30,900–33,100 lb) — biomechanical estimate Jurassic World depiction ~22 m (72 ft) — significantly larger than fossil … Read more
Field Information Species Otodus megalodon — Otodontidae Pronunciation oh-TOH-dus MEG-uh-loh-don Syllable count Otodus: 3 syllables / megalodon: 4 syllables Name origin Greek: ous (ear) + odous (tooth) / megas (large) + odous (tooth) Common mispronunciation meh-GAL-oh-don (stress error); ott-OH-dus (vowel error) Quick Answer:Otodus megalodon is pronounced oh-TOH-dus MEG-uh-loh-don. The stress in Otodus falls on the … Read more
Field Information Species Otodus megalodon — Otodontidae First appearance Early Miocene, ~23 Ma Last appearance Early Pliocene, ~3.6 Ma Total temporal range ~19.4 million years Contemporary world Warm Miocene seas; early whales; no non-avian dinosaurs Quick Answer: Megalodon lived from approximately 23 million years ago to 3.6 million years ago — spanning the Early Miocene … Read more
Field Information Species Otodus megalodon — Otodontidae Classification Chondrichthyes (cartilaginous fish) — not a reptile, not a dinosaur Period Miocene to Early Pliocene, ~23–3.6 Ma Dinosaur extinction ~66 Ma — megalodon appeared ~43 million years later Common confusion source Both are large extinct prehistoric animals Quick Answer: Megalodon is not a dinosaur. It was a … Read more