Science, Tech, Math › Animals & Nature Otodus Facts and Figures Share Flipboard Email Print Jeff Rotman / Getty Images Animals & Nature Dinosaurs Marine Reptiles Basics Paleontologists Carnivores Dinosaurs & Birds Herbivores Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated November 05, 2019 Name: Otodus (Greek for "inclined teeth"); pronounced OH-toe-dussHabitat: Oceans worldwideHistorical Epoch: Paleocene-Eocene (60-45 million years ago)Size and Weight: About 30 feet long and 1-2 tonsDiet: Marine animalsDistinguishing Characteristics: Large size; long, sharp, triangular teeth About Otodus Since the skeletons of sharks are composed of biodegradable cartilage rather than longer-lasting bone, often times the only fossil evidence of prehistoric species consists of teeth (sharks grow and shed thousands of teeth during their lifetimes, which is why they're so abundant in the fossil record). That's the case with the early Cenozoic Otodus, whose huge (three or four inches long), sharp, triangular teeth point to a full-grown adult size of up to 30 feet, though we know frustratingly little else about this prehistoric shark, other than that it likely fed on prehistoric whales, other, smaller sharks, and the abundant prehistoric fish that lived in the world's oceans 50 million years ago. Its fossilized teeth aside, Ototodus' greatest claim to fame is that it seems to have been directly ancestral to Megalodon, the 50-foot-long, 50-ton predatory behemoth that ruled the world's oceans right until the cusp of the modern era. (This is not to diminish Otodus' own place in the record books; this prehistoric shark was at least one and one-half times as big as the biggest Great White Sharks alive today.) Paleontologists have established this evolutionary link by examining the similarities between these two sharks' teeth; specifically, the teeth of Otodus show early hints of the flesh-ripping serrations that would later characterize the teeth of Megalodon.