WebFeb 27, 2013 · An ancient sea predator had a spiraling whorl of teeth that acted as a lethal slicing tool, according to new scans of a mysterious fossil. Helicoprion was a bizarre creature that went extinct some ... Webnarwhal, (Monodon monoceros), a small toothed whale found along coasts and in rivers throughout the Arctic. Males possess a long straight tusk that projects forward from above the mouth. Narwhals lack a dorsal fin, and in adults the flippers are turned upward at the tips. Their mottled gray bodies are darker above than below, and they usually attain a …
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WebJun 22, 2024 · And additional fish have mouths with teeth in the back, nearly in their throat. These pharyngeal teeth assist in holding and swallowing prey. Superior, or sometimes called supra-terminal, mouths … Helicoprion is an extinct genus of shark-like eugeneodont fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls", which in life were embedded in the lower jaw. As with most extinct cartilaginous fish, the skeleton is mostly unknown. Fossils of … See more Like other chondrichthyan fish, Helicoprion and other eugeneodonts had skeletons made of cartilage. As a result, the entire body disintegrated once it began to decay, unless preserved by exceptional circumstances. … See more Skull data from IMNH 37899 reveals several characteristics, such as an autodiastylic jaw suspension without an integrated … See more • Sharks portal • Paleontology portal See more The unusual saw-like tooth whorl and the lack of wear on the teeth of Helicoprion implies a diet of soft bodied prey, as hard shelled prey would … See more Three species of Helicoprion are currently considered valid via morphometric analyses, differing in the proportions of the upper, middle and lower sections of the tooth crown. These … See more fishes in market
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WebIllinois is home to a wide variety of fish species. At present 34 families of fishes are represented in the state's waters. Because so many species exist, the fish exhibit a wide range of habits and characteristics. The information contained in these pages is Illinois specific as much as possible. Several species are highlighted in the family ... WebFeb 28, 2012 · The spiral valve in the intestine of a shark serves what purpose? ... (fill in blank) is composed of vertebrates having eel-like bodies, a biting mouth with two rows of eversible teeth, and numerous slime glands. Myxini ... A lobe-finned fish thought to have been extinct for 70 million year, ... WebAir flow through the mouth is tidal, and through the lungs it is bidirectional and observes "uniform pool" diffusion of oxygen. Ecology and life history. Lungfish are omnivorous, feeding on fish, insects, crustaceans, worms, mollusks, amphibians and plant matter. They have an intestinal spiral valve rather than a true stomach. fishes in philippine rivers