Pterosaur
Related Category: Vertebrate Zoology
(tr´sőr´´) [Gr.
Pterosaurs had hands. Three fingers were claws, but the long fourth finger was part of the wing. The wings had stiff fibres that were like the ribs of an umbrella, with thin leathery skin stretched over them.
[edit] Pterosaurs
Only one family of pterosaurs, Azhdarchidae, was definitely present in the Maastrichtian, and it became extinct at the K-T boundary.
Pterosaurs were the first group of vertebrate animals to adopt an aerial lifestyle. They had no competition in the air for about 90 million years, until the evolution of birds in the Late Jurassic Period.
Like most birds and pterosaurs, bats have a keel on the sternum, or breastbone, to which the large flight muscles attach.
notably the absence of the keel and of the power of flight, induced certain authors to go so far as to derive the Ratitae from the Dinosaurian reptiles, whilst Archaeopteryx (q.v.) and the Carinatae were supposed to have sprung from some Pterosaurian ...
Pterosaur, Pteranodon ingens
Pterosaur, Rhamphorhynchus muensteri
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By far the most successful of the reptiles were the archosaurs ('ruling reptiles') which included the dinosaurs and the flying reptiles, pterosaurs.
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Scientists classify dinosaurs within a larger group of animals called archosaurians, which also includes crocodiles, alligators and their relatives -- pterosaurians (extinct flying reptiles such as Pterodactyls), birds and thecodonts, ...
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Minor extinction 82 mya. Ended with large extinction (the K-T extinction) of dinosaurs, pterosaurs, ammonites, about 50 percent of marine invertebrate species, etc., probably caused by asteroid impact or volcanism.
The largest bat known, the wingspan of the species Pteropus giganteus can measure 180 centimeters (6 feet) across, although it only weighs up to 1.5 kilograms (53 ounces). This makes Pteropus smaller than the largest birds or extinct pterosaurs.
mass extinction - also known as the K/T extinction - is famed for the death of the dinosaurs. However, many other organisms perished at the end of the Cretaceous including the ammonites, many flowering plants and the last of the pterosaurs.
development between the Amphibians and the Mammals and Birds. The living lineage of this animal class (Reptilia) includes the Turtles, Crocodiles, Snakes, Lizards, and Tuatra. The extinct reptiles include the Dinosaurs, Ichthyosaurs, and Pterosaurs.
spending most or all of their time in the forest canopy. One group (bats) have even evolved powered flight, which represents only the third time that this ability has evolved in vertebrates (the other two groups being birds and extinct Pterosaurs).
 See also: Dinosaur, Reptile, Lizard, Turtle, Snake
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