- 1 Are ichthyosaurs Lepidosaurs?
- 2 Why is an ichthyosaur not a dinosaur?
- 3 Are ichthyosaurs extinct?
- 4 Are ichthyosaurs related to dolphins?
- 5 Are ichthyosaurs Diapsids?
- 6 What dinosaur looks like a shark?
- 7 What is and isn’t a dinosaur?
- 8 Is the ichthyosaur bigger than the blue whale?
- 9 What’s the difference between a reptile and a dinosaur?
- 10 What did a plesiosaur eat?
- 11 Why did ichthyosaurs go extinct?
- 12 Why are dolphins and ichthyosaurs not related?
- 13 Is Dolphin a reptile or mammal?
- 14 What does ichthyosaurus mean in English?
Are ichthyosaurs Lepidosaurs?
Ichthyosaur, any member of an extinct group of aquatic reptiles, most of which were very similar to porpoises in appearance and habits. These distant relatives of lizards and snakes (lepidosaurs) were the most highly specialized aquatic reptiles, but ichthyosaurs were not dinosaurs.
Why is an ichthyosaur not a dinosaur?
Ichthyosaurs were not dinosaurs, but represent a separate group of marine vertebrates. Because ichthyosaurs were so specialized and modified for life in the ocean, we don’t really know which group of vertebrates were their closest relatives.
Are ichthyosaurs extinct?
Ichthyosaurs (Greek for “fish lizard” – ιχθυς or ichthys meaning “fish” and σαυρος or sauros meaning “lizard”) are large extinct marine reptiles.
Mesozoic “fish lizards”, ichthyosaurs were marine reptiles that independently became adapted to a life at sea around 200 million years before dolphins. An Opthalmosaurus looks kind of like a bottlenose dolphin, sure, but stopping at superficial similarities isn’t very scientific.
Are ichthyosaurs Diapsids?
Ichthyosaurs are superficially dolphin-like reptiles that were important marine predators from the Triassic Period through the middle of the Cretaceous Period. For now, paleontologists think that ichthyosaurs are diapsids, but exactly where they fit in the diapsid tree is not yet known.
What dinosaur looks like a shark?
Helicoprion or the tooth slayer is an absurd-looking shark from the Permian age, best known for its spiralling whorl of teeth.
What is and isn’t a dinosaur?
Dinosaurs are archosaurs, a larger group of reptiles that first appeared about 251 million years ago, near the start of the Triassic Period. These and many other types of ancient reptiles are often wrongly called dinosaurs. Marine reptiles, such as ichthyosaurs, plesiosaurs and mosasaurs are not dinosaurs.
Is the ichthyosaur bigger than the blue whale?
Known as an ichthyosaur, the animal lived about 205 million years ago and was up to 85 feet long— almost as big as a blue whale, say the authors of a study describing the fossil published today in PLOS ONE. A prehistoric “sea dragon” described from a museum fossil specimen is the largest known animal of its kind.
What’s the difference between a reptile and a dinosaur?
Reptiles, such as crocodiles and lizards, have legs that sprawl out to the side. Their thigh bones are almost parallel to the ground. They walk and run with a side-to-side motion. Dinosaurs, on the other hand, stand with their legs positioned directly under their bodies.
What did a plesiosaur eat?
They ate fish, squids, mollusks and other small sea creatures. Recently, scientists have found evidence that the Plesiosaurs may have also been “bottom-feeders”. That is, they would feed from the bottom of the sea – on things like clams and snails.
Why did ichthyosaurs go extinct?
Ichthyosaurs – shark-like marine reptiles from the time of dinosaurs – were driven to extinction by intense climate change and their own failure to evolve quickly enough, according to new research by an international team of scientists.
Although they superficially have a similar shape and they exploit similar environmental niches, we know that ichthyosaurs are reptiles and thus they are not dolphins (mammals) nor sharks (fish). Their fins were so modified that they were unable to leave the water and no ichthyosaurs were capable of walking on land.
Is Dolphin a reptile or mammal?
Even though they live in the ocean all of the time, dolphins are mammals, not fish. Also, dolphins are different than “dolphinfish,” which are also known as mahi-mahi. Like every mammal, dolphins are warm blooded. Unlike fish, who breathe through gills, dolphins breathe air using lungs.
What does ichthyosaurus mean in English?
(ˈɪkθɪəˌsɔː ) or ichthyosaurus (ˌɪkθɪəˈsɔːrəs ) nounWord forms: plural -saurs, -sauruses or -sauri (-ˈsɔːraɪ) any extinct marine Mesozoic reptile of the order Ichthyosauria, which had a porpoise-like body with dorsal and tail fins and paddle-like limbs.