https://nordan.daynal.org/w/index.php?title=Mammals&feed=atom&action=historyMammals - Revision history2024-03-28T09:20:06ZRevision history for this page on the wikiMediaWiki 1.35.0https://nordan.daynal.org/w/index.php?title=Mammals&diff=132135&oldid=prevMywikis: Text replacement - "http://" to "https://"2020-12-13T05:22:32Z<p>Text replacement - "http://" to "https://"</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:22, 13 December 2020</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Etymology==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Etymology==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>New Latin Mammalia, from Late Latin, neuter plural of mammalis of the [[breast]], from Latin mamma breast</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>New Latin Mammalia, from Late Latin, neuter plural of mammalis of the [[breast]], from Latin mamma breast</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*Date: [<del class="diffchange diffchange-inline">http</del>://www.wikipedia.org/wiki/19th_Century 1826]</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*Date: [<ins class="diffchange diffchange-inline">https</ins>://www.wikipedia.org/wiki/19th_Century 1826]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Definition==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Definition==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>1 : any of a class (Mammalia) of warm-blooded higher [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Vertebrate vertebrates] (as placentals, marsupials, or monotremes) that nourish their young with [[milk]] secreted by [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Mammary_gland mammary glands], have the skin usually more or less covered with hair, and include [[humans]]</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>1 : any of a class (Mammalia) of warm-blooded higher [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Vertebrate vertebrates] (as placentals, marsupials, or monotremes) that nourish their young with [[milk]] secreted by [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Mammary_gland mammary glands], have the skin usually more or less covered with hair, and include [[humans]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Description==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Description==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Mammals (formally Mammalia) are a class of [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Vertebrate vertebrate], [[air]]-[[breathing]] [[animals]] whose [[females]] are characterized by the [[possession]] of [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Mammary_gland mammary glands] while both [[males]] and [[females]] are characterized by [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Sweat_gland sweat glands], [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Hair hair] and/or fur, three middle ear bones used in hearing, and a [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Neocortex neocortex] region in the [[brain]].</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Mammals (formally Mammalia) are a class of [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Vertebrate vertebrate], [[air]]-[[breathing]] [[animals]] whose [[females]] are characterized by the [[possession]] of [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Mammary_gland mammary glands] while both [[males]] and [[females]] are characterized by [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Sweat_gland sweat glands], [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Hair hair] and/or fur, three middle ear bones used in hearing, and a [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Neocortex neocortex] region in the [[brain]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Mammals are divided into three main infraclass taxa depending how they are born. These taxa are: [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Monotremes monotremes], [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Marsupials marsupials] and [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Placentals placentals]. Except for the five species of monotremes (which lay eggs), all mammal [[species]] give [[birth]] to live young. Most mammals also [[possess]] specialized [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Teeth teeth], and the largest group of mammals, the placentals, use a [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Placenta placenta] during gestation. The mammalian [[brain]] regulates [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Warm-blooded endothermic] and [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Circulatory_system circulatory systems], including a four-chambered [[heart]].</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Mammals are divided into three main infraclass taxa depending how they are born. These taxa are: [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Monotremes monotremes], [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Marsupials marsupials] and [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Placentals placentals]. Except for the five species of monotremes (which lay eggs), all mammal [[species]] give [[birth]] to live young. Most mammals also [[possess]] specialized [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Teeth teeth], and the largest group of mammals, the placentals, use a [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Placenta placenta] during gestation. The mammalian [[brain]] regulates [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Warm-blooded endothermic] and [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Circulatory_system circulatory systems], including a four-chambered [[heart]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>There are approximately 5,400 species of mammals, distributed in about 1,200 [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Genus genera], 153 [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Family_(biology) families], and 29 [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Order_(biology) orders] (though this varies by [[classification]] [[scheme]]). Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) Bumblebee Bat to the 33-meter (108-foot) Blue Whale.</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>There are approximately 5,400 species of mammals, distributed in about 1,200 [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Genus genera], 153 [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Family_(biology) families], and 29 [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Order_(biology) orders] (though this varies by [[classification]] [[scheme]]). Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) Bumblebee Bat to the 33-meter (108-foot) Blue Whale.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Mammals are divided into two subclasses: the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Prototheria Prototheria], which includes the oviparous monotremes, and the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Theria Theria], which includes the placentals and live-bearing marsupials. Most mammals, including the six largest orders, belong to the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Placental placental] group. The three largest orders, in descending order, are [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Rodentia Rodentia] (mice, rats, porcupines, beavers, capybaras, and other gnawing mammals), [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Chiroptera Chiroptera] (bats), and [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Soricomorpha Soricomorpha] (shrews, moles and solenodons). The next three largest orders include the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Carnivora Carnivora] (dogs, cats, weasels, bears, seals, and their relatives), the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Cetartiodactyla Cetartiodactyla] (including the even-toed hoofed mammals and the whales) and the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Primates Primates] to which the [[human]] [[species]] belongs. The [[relative]] size of these latter three orders differs according to the [[classification]] scheme and definitions used by various [[authors]].</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Mammals are divided into two subclasses: the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Prototheria Prototheria], which includes the oviparous monotremes, and the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Theria Theria], which includes the placentals and live-bearing marsupials. Most mammals, including the six largest orders, belong to the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Placental placental] group. The three largest orders, in descending order, are [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Rodentia Rodentia] (mice, rats, porcupines, beavers, capybaras, and other gnawing mammals), [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Chiroptera Chiroptera] (bats), and [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Soricomorpha Soricomorpha] (shrews, moles and solenodons). The next three largest orders include the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Carnivora Carnivora] (dogs, cats, weasels, bears, seals, and their relatives), the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Cetartiodactyla Cetartiodactyla] (including the even-toed hoofed mammals and the whales) and the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Primates Primates] to which the [[human]] [[species]] belongs. The [[relative]] size of these latter three orders differs according to the [[classification]] scheme and definitions used by various [[authors]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Phylogenetics Phylogenetically], Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).[2] This means that some extinct groups of "mammals" are not members of the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Crown_group crown group] Mammalia, even though most of them have all the characteristics that [[traditionally]] would have [[classified]] them as mammals. These "mammals" are now usually placed in the unranked clade [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Mammaliaformes Mammaliaformes].</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Phylogenetics Phylogenetically], Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).[2] This means that some extinct groups of "mammals" are not members of the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Crown_group crown group] Mammalia, even though most of them have all the characteristics that [[traditionally]] would have [[classified]] them as mammals. These "mammals" are now usually placed in the unranked clade [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Mammaliaformes Mammaliaformes].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The mammalian line of [[descent]] diverged from an amniote line at the end of the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Carboniferous Carboniferous] period. One line of amniotes would lead to [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Reptile reptiles], while the other would lead to synapsids. According to cladistics, mammals are a sub-group of [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Synapsid synapsids]. Although they were preceded by many [[diverse]] groups of non-mammalian synapsids (sometimes misleadingly referred to as mammal-like reptiles), the first true mammals appeared in the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Triassic Triassic] period. Modern mammalian orders appeared in the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Palaeocene Palaeocene] and [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Eocene Eocene] [[epochs]] of the [<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Palaeogene Palaeogene] period.[<del class="diffchange diffchange-inline">http</del>://en.wikipedia.org/wiki/Mammal]</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The mammalian line of [[descent]] diverged from an amniote line at the end of the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Carboniferous Carboniferous] period. One line of amniotes would lead to [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Reptile reptiles], while the other would lead to synapsids. According to cladistics, mammals are a sub-group of [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Synapsid synapsids]. Although they were preceded by many [[diverse]] groups of non-mammalian synapsids (sometimes misleadingly referred to as mammal-like reptiles), the first true mammals appeared in the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Triassic Triassic] period. Modern mammalian orders appeared in the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Palaeocene Palaeocene] and [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Eocene Eocene] [[epochs]] of the [<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Palaeogene Palaeogene] period.[<ins class="diffchange diffchange-inline">https</ins>://en.wikipedia.org/wiki/Mammal]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category: Biology]]</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category: Biology]]</div></td></tr>
</table>Mywikishttps://nordan.daynal.org/w/index.php?title=Mammals&diff=56921&oldid=prevRdavis: Created page with 'File:lighterstill.jpgframe ==Etymology== New Latin Mammalia, from Late Latin, neuter plural of mammalis of the breast, from Latin mamma ...'2010-06-12T22:17:48Z<p>Created page with '<a href="/wiki/File:Lighterstill.jpg" title="File:Lighterstill.jpg">File:lighterstill.jpg</a><a href="/wiki/File:Mammal_orders.jpg" title="File:Mammal orders.jpg">right|frame</a> ==Etymology== New Latin Mammalia, from Late Latin, neuter plural of mammalis of the <a href="/wiki/Breast" title="Breast">breast</a>, from Latin mamma ...'</p>
<p><b>New page</b></p><div>[[File:lighterstill.jpg]][[File:Mammal_orders.jpg|right|frame]]<br />
<br />
==Etymology==<br />
New Latin Mammalia, from Late Latin, neuter plural of mammalis of the [[breast]], from Latin mamma breast<br />
*Date: [http://www.wikipedia.org/wiki/19th_Century 1826]<br />
==Definition==<br />
1 : any of a class (Mammalia) of warm-blooded higher [http://en.wikipedia.org/wiki/Vertebrate vertebrates] (as placentals, marsupials, or monotremes) that nourish their young with [[milk]] secreted by [http://en.wikipedia.org/wiki/Mammary_gland mammary glands], have the skin usually more or less covered with hair, and include [[humans]]<br />
==Description==<br />
Mammals (formally Mammalia) are a class of [http://en.wikipedia.org/wiki/Vertebrate vertebrate], [[air]]-[[breathing]] [[animals]] whose [[females]] are characterized by the [[possession]] of [http://en.wikipedia.org/wiki/Mammary_gland mammary glands] while both [[males]] and [[females]] are characterized by [http://en.wikipedia.org/wiki/Sweat_gland sweat glands], [http://en.wikipedia.org/wiki/Hair hair] and/or fur, three middle ear bones used in hearing, and a [http://en.wikipedia.org/wiki/Neocortex neocortex] region in the [[brain]].<br />
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Mammals are divided into three main infraclass taxa depending how they are born. These taxa are: [http://en.wikipedia.org/wiki/Monotremes monotremes], [http://en.wikipedia.org/wiki/Marsupials marsupials] and [http://en.wikipedia.org/wiki/Placentals placentals]. Except for the five species of monotremes (which lay eggs), all mammal [[species]] give [[birth]] to live young. Most mammals also [[possess]] specialized [http://en.wikipedia.org/wiki/Teeth teeth], and the largest group of mammals, the placentals, use a [http://en.wikipedia.org/wiki/Placenta placenta] during gestation. The mammalian [[brain]] regulates [http://en.wikipedia.org/wiki/Warm-blooded endothermic] and [http://en.wikipedia.org/wiki/Circulatory_system circulatory systems], including a four-chambered [[heart]].<br />
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There are approximately 5,400 species of mammals, distributed in about 1,200 [http://en.wikipedia.org/wiki/Genus genera], 153 [http://en.wikipedia.org/wiki/Family_(biology) families], and 29 [http://en.wikipedia.org/wiki/Order_(biology) orders] (though this varies by [[classification]] [[scheme]]). Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) Bumblebee Bat to the 33-meter (108-foot) Blue Whale.<br />
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Mammals are divided into two subclasses: the [http://en.wikipedia.org/wiki/Prototheria Prototheria], which includes the oviparous monotremes, and the [http://en.wikipedia.org/wiki/Theria Theria], which includes the placentals and live-bearing marsupials. Most mammals, including the six largest orders, belong to the [http://en.wikipedia.org/wiki/Placental placental] group. The three largest orders, in descending order, are [http://en.wikipedia.org/wiki/Rodentia Rodentia] (mice, rats, porcupines, beavers, capybaras, and other gnawing mammals), [http://en.wikipedia.org/wiki/Chiroptera Chiroptera] (bats), and [http://en.wikipedia.org/wiki/Soricomorpha Soricomorpha] (shrews, moles and solenodons). The next three largest orders include the [http://en.wikipedia.org/wiki/Carnivora Carnivora] (dogs, cats, weasels, bears, seals, and their relatives), the [http://en.wikipedia.org/wiki/Cetartiodactyla Cetartiodactyla] (including the even-toed hoofed mammals and the whales) and the [http://en.wikipedia.org/wiki/Primates Primates] to which the [[human]] [[species]] belongs. The [[relative]] size of these latter three orders differs according to the [[classification]] scheme and definitions used by various [[authors]].<br />
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[http://en.wikipedia.org/wiki/Phylogenetics Phylogenetically], Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).[2] This means that some extinct groups of "mammals" are not members of the [http://en.wikipedia.org/wiki/Crown_group crown group] Mammalia, even though most of them have all the characteristics that [[traditionally]] would have [[classified]] them as mammals. These "mammals" are now usually placed in the unranked clade [http://en.wikipedia.org/wiki/Mammaliaformes Mammaliaformes].<br />
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The mammalian line of [[descent]] diverged from an amniote line at the end of the [http://en.wikipedia.org/wiki/Carboniferous Carboniferous] period. One line of amniotes would lead to [http://en.wikipedia.org/wiki/Reptile reptiles], while the other would lead to synapsids. According to cladistics, mammals are a sub-group of [http://en.wikipedia.org/wiki/Synapsid synapsids]. Although they were preceded by many [[diverse]] groups of non-mammalian synapsids (sometimes misleadingly referred to as mammal-like reptiles), the first true mammals appeared in the [http://en.wikipedia.org/wiki/Triassic Triassic] period. Modern mammalian orders appeared in the [http://en.wikipedia.org/wiki/Palaeocene Palaeocene] and [http://en.wikipedia.org/wiki/Eocene Eocene] [[epochs]] of the [http://en.wikipedia.org/wiki/Palaeogene Palaeogene] period.[http://en.wikipedia.org/wiki/Mammal]<br />
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[[Category: Biology]]</div>Rdavis