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26 de jun. de 2024 · Aves (birds) See text for extinct groups. Reptiles, as commonly defined, are a group of tetrapods with an ectothermic ('cold-blooded') metabolism and amniotic development. Living reptiles comprise four orders: Testudines ( turtles ), Crocodilia ( crocodilians ), Squamata ( lizards and snakes ), and Rhynchocephalia (the tuatara ).
Há 5 dias · Diversity [1] 132 families, c. 50,000 species. Spiders ( order Araneae) are air-breathing arthropods that have eight limbs, chelicerae with fangs generally able to inject venom, [2] and spinnerets that extrude silk. [3] They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms.
19 de jun. de 2024 · Chordate - Evolution, Paleontology, Anatomy: Chordates may have originated earlier than 590 million years ago and predate the fossil record. Hemichordates are probably the closest relatives of chordates. Phylum Chordata has three subphyla: Tunicata (Urochordata or tunicates); Cephalochordata (Acrania or lancelets); and Vertebrata (Craniata or vertebrates).
Há 6 dias · The snowy owl ( Bubo scandiacus ), [5] also known as the polar owl, the white owl and the Arctic owl, [6] is a large, white owl of the true owl family. [7] Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mostly on the tundra. [3] It has a number of unique adaptations to its habitat and lifestyle ...
24 de jun. de 2024 · Description. The zebrafish is named for the five uniform, pigmented, horizontal, blue stripes on the side of the body, which are reminiscent of a zebra's stripes, and which extend to the end of the caudal fin. Its shape is fusiform and laterally compressed, with its mouth directed upwards.
Há 3 dias · Green sea turtle. The green sea turtle ( Chelonia mydas ), also known as the green turtle, black (sea) turtle or Pacific green turtle, [4] is a species of large sea turtle of the family Cheloniidae. It is the only species in the genus Chelonia. [5] Its range extends throughout tropical and subtropical seas around the world, with two distinct ...
24 de jun. de 2024 · Diracodon Marsh, 1881. Stegosaurus ( / ˌstɛɡəˈsɔːrəs /; [2] lit. 'roof-lizard') is a genus of herbivorous, four-legged, armored dinosaur from the Late Jurassic, characterized by the distinctive kite-shaped upright plates along their backs and spikes on their tails.
