Archelon had a wide, flattened shell, paddle-like legs, a long, narrow head, weak jaws, and a short, pointed tail. well placed to exert turning forces on the whale. Ch14 Life of the Mesozoic Notes - The Earth Through Time CHAPTER 14 A beluga whale has broad and short-sized flippers that result in square-shaped flippers. The flippers of penguins became thicker, denser and smaller while being modified for hydrodynamic properties. Humpback whales live in all of the worlds oceans. Their flippers are almost squared-shaped because theyre short and wide. An introduction to evolution: what is evolution and how does it work? The bowhead whale, also known as the Greenland right whale, is about 45-60 feet long and weighs 75-100 tons when full-grown. The walrus is found in the Arctic Ocean and in subarctic seas. homeotherms As an Amazon Associate I earn from qualifying purchases. . Fur seals flippers are long and flexible. Air exchange through the blowhole at the surface is very quick, taking only a fraction of a second to exhale and then inhale to fill their lungs with air. Its flipper, dorsal fins, and flukes help to achieve a speed of about 25 km per hour. flipper. modified into paddles, hindlimbs absent . Their massive flippers look like paddles and keep the animal balanced in the water. walruses, earless and eared seals ), sirenians (e.g. Marine Reptiles, birds, and mammals Flashcards | Quizlet single nostril (flp ) noun. Manatees have 3 to 4 nails that grow on each of their front flippers. Great whales produce a spout when exhaling, appneuistic breathing- if they are going to take a long dive pant at surface to oxygenate the blood then exhale all the air before they dive They have paddle-like flippers and a tail fluke that resembles the dolphin. Vaquita are a small species of porpoise found in the Gulf of California. relatively small (except for sperm whale)deep diving great whale; eat squid and coat the beak with waxy coating to pass it- floats to the surface (ambergris) and is used in perfume though now it can be created synthetically), baleen whales- rows of flexible fibrous plates made of keratin . What Animals Live in a Tropical Rainforest? Surprisingly, The combinations of flippers and tail flukes help to attain a maximum speed of about 25 kmph. Hind limbs of opossum and hippo are . gulls, puffins, terns, skuas, skimmers (large lower beak) razorbill (can fly and swim with wings), beak is only brightly colored in the spring (breeding) smallest marine mammal Some flippers are very efficient hydrofoils, analogous to wings (airfoils), used to propel and maneuver through the water with great speed and maneuverability (see Foil). Hyperphalangy was present among extinct ichthyosaurs, plesiosaurs, and mosasaurs. noise. Large rounded tubercles along the leading edge of the flipper are morphological structures that are unique in nature. All four limbs are modified into paddle-like flippers, and the long tail has a fluke at the end. D. Pectoral flippers. The thoracic (rib) cage is well developed, and the sternum bears a pronounced keel for the attachment of the pectoral muscles, which move the flippers.
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