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Artiodactyla is an order of placental mammals composed of even-toed ungulates – hooved animals which bear weight equally on two of their five toes with the other toes either present, absent, vestigial, or pointing posteriorly – as well as their descendants, the aquatic cetaceans. Members of this order are called artiodactyls.
File:An introduction to the classification of animals (IA introductiontocl00huxl).pdf. File. File history. File usage. Global file usage. Metadata. Size of this JPG preview of this PDF file: 356 × 599 pixels. Other resolutions: 142 × 240 pixels | 285 × 480 pixels | 781 × 1,314 pixels.
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
It is possible that some protocetids had flukes. However, it is clear that they were adapted even further to an aquatic life-style. In Rodhocetus, for example, the sacrum (a bone that, in land-mammals, is a fusion of five vertebrae that connects the pelvis with the rest of the vertebral column) was divided into loose vertebrae. However, the ...
Boreoeutheria (/ boʊˌriːoʊjuːˈθɛriə /, "northern true beasts") is a magnorder of placental mammals that groups together superorders Euarchontoglires and Laurasiatheria. [1][2][5] With a few exceptions, [a] male boreoeutherians have a scrotum, an ancestral feature of the clade. [6][7] The sub-clade Scrotifera was named after this ...
History of Animals (Greek: Τῶν περὶ τὰ ζῷα ἱστοριῶν, Ton peri ta zoia historion, "Inquiries on Animals"; Latin: Historia Animalium, "History of Animals") is one of the major texts on biology by the ancient Greek philosopher Aristotle, who had studied at Plato's Academy in Athens. It was written in the fourth century BC ...
Stridulation is the act of producing sound by rubbing together certain body parts. This behavior is mostly associated with insects, but other animals are known to do this as well, such as a number of species of fish, snakes and spiders. The mechanism is typically that of one structure with a well-defined lip, ridge, or nodules (the "scraper" or ...
List of mosasaur genera. List of prehistoric annelid genera. List of prehistoric barnacles. List of prehistoric brittle stars. List of prehistoric bryozoan genera. List of prehistoric chitons. List of prehistoric foraminifera genera. List of ichthyosaur genera. List of marine gastropod genera in the fossil record.
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