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13 lut 2019 · Sea jellies (aka jellyfish) are a charismatic subphylum that is familiar to all. Fossil evidence dates sea jellies as far back as 500 million years ago—if not longer. Because they are soft bodied creatures and are at least 95% water, their fossils are extremely difficult to find, but not impossible when preserved in fine sediment.
These extinct sea creatures were cephalopods, making them relatives of today’s octopuses, squids and nautiluses. About 199 million years ago, during the Earth’s Jurassic Period, ammonites would have been found in abundance in shallow, tropical ocean waters.
7 gru 2021 · Plesiosaurs had no gills so they had to come up to the surface for air just like marine mammals do today. That isn’t the only thing they have in common with modern dolphins and whales. A fossil found of a pregnant plesiosaur gives us evidence to support that these creatures gave birth to live young.
During the Mesozoic, the time period when dinosaurs roamed on land, many of these large creatures were the top predators in the ocean food chain and fed on fish, cephalopods, bivalves, and even one another. The most notable of these reptiles were the ichthyosaurs, plesiosaurs, mosasaurs, and sea turtles.
23 lip 2024 · A list of prehistoric sea creatures, including animals that inhabited the world’s oceans before, during, and after the age of the dinosaurs. Read on to discover amazing prehistoric ocean animals such as plesiosaurs, ichthyosaurs, pliosaurs, mosasaurs and ammonites.
17 mar 2017 · Pictures and detailed profiles of over 30 prehistoric fish, ranging from the earliest vertebrates to modern lobe-finned and ray-finned fish.
See some of the most complete fossils of these prehistoric sea animals, including ichthyosaurs and plesiosaurs, and learn about the work of pioneering palaeontologist Mary Anning. Plus, look out for the skeleton cast of the giant ground sloth, a land mammal often mistaken for a dinosaur.
