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Mammal

The mammals are the class of vertebrate animals characterized by the presence of mammary glands, which in females produce milk for the nourishment of young; the presence of hair or fur; and which have endothermic or "warm-blooded" bodies. more...

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MythologicalMythological
ReptileReptile


The brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals encompass some 5500 species, distributed in about 1200 genera, 152 families and up to 46 orders, though this varies depending on the classification scheme adopted.

Phylogenetically, Mammalia is defined as all of the descendants of the last common ancestor of monotremes (e.g., echidnas) and therian mammals (placentals and marsupials).

Characteristics

While most mammals give birth to live young, there are a few mammals (the monotremes) that lay eggs. Live birth also occurs in a variety of non-mammalian species, such as guppies and hammerhead sharks; thus it is not a distinguishing characteristic of mammals. Although all mammals are endothermic, so are birds and so this is also not a main defining feature.

While monotremes do not have nipples, they do have mammary glands, meaning that they meet all conditions for inclusion in the class Mammalia. It should be noted that the current trend in taxonomy is to emphasize common ancestry; the diagnostic characteristics are useful for identifying this ancestry, but if, for example, a cetacean were found that had no hair at all, it would still be classified as a mammal.

Mammals have three bones in each ear and one (the dentary) on each side of the lower jaw; all other vertebrates with ears have one bone (the stapes) in the ear and at least three on each side of the jaw. A group of therapsids called cynodonts had three bones in the jaw, but the main jaw joint was the dentary and the other bones conducted sound. The extra jaw bones of other vertebrates are thought to be homologous with the malleus and incus of the mammal ear.

All mammalian brains possess a neocortex. This brain region is unique to mammals.

Mammals have integumentary systems made up of three layers: the outermost epidermis, the dermis, and the hypodermis.

The epidermis is typically ten to thirty cells thick, its main function being to provide a waterproof layer. Its outermost cells are constantly lost; its bottommost cells are constantly dividing and pushing upward. The middle layer, the dermis, is fifteen to forty times thicker than the epidermis. The dermis is made up of many components such as bony structures and blood vessels. The hypodermis is made up of adipose tissue. Its job is to store lipids, and to provide cushioning and insulation. The thickness of this layer varies widely from species to species.

Most mammals are terrestrial, but a number are aquatic, including sirenia (manatees and dugongs) and the cetaceans (dolphins and whales). Whales are the largest of all animals. There are semi-aquatic species such as seals which come to land to breed but spend the majority of the time in water.

True flight has evolved only once in mammals, the bats; mammals such as flying squirrels and flying lemurs are actually gliding animals.

No mammals have hair naturally blue or green in colour. Some cetaceans, along with the mandrills appear to have shades of blue skin. Many mammals are indicated as having blue hair or fur, but in all cases, it will be found to be a shade of grey. The two-toed sloth can seem to have green fur, however, this colour is caused by algae growths.

Origins

Mammals belong among the amniotes, and in particular to a group called the synapsids, distinguished by the shape of their skulls, in particular the presence of a single hole where jaw muscles attach, called temporal fenestra. In comparison, dinosaurs, birds, and most reptiles are diapsids, with two temporal fenestrae; and turtles, with no temporal fenestra, are anapsids.

From synapsids came the first mammal precursors, therapsids, and more specifically the eucynodonts, 220 million years ago (mya) during the Triassic period.

Pre-mammalian ears began evolving in the late Permian to early Triassic to their current state, as three tiny bones (incus, malleus, and stapes) inside the skull; accompanied by the transformation of the lower jaw into a single bone. Other animals, including reptiles and pre-mammalian synapsids and therapsids, have several bones in the lower jaw, some of which are used for hearing; and a single ear-bone in the skull, the stapes. This transition is evidence of mammalian evolution from reptilian beginnings: from a single ear bone, and several lower jaw bones (for example the sailback pelycosaur, Dimetrodon) to progressively smaller "hearing jaw bones" (for example the cynodont, Probainognathus), and finally (possibly with Morganucodon, but definitely with Hadrocodium), true mammals with three ear bones in the skull and a single lower jaw bone. Hence pelycosaurs and cynodonts are sometimes called "mammal-like reptiles", though this is strictly incorrect since in modern parlance these two are not reptiles, but rather synapsids.

During the Mesozoic Period mammals diversified into four main groups: multituberculates, monotremes, marsupials, and placentals. Multituberculates went extinct during the Oligocene, about 30 million years ago, but the three other mammal groups are all represented today. Most early mammals remained small and shrew-like throughout the Mesozoic, but rapidly developed into larger more diverse forms following the Cretaceous-Tertiary extinction event 65 mya.

The names "Prototheria", "Metatheria" and "Eutheria" expressed the theory that Placentalia were descendants of Marsupialia, which were in turn descendants of Monotremata, but this theory has been refuted. However, Eutheria and Metatheria are often used in paleontology, especially with regards to mammals of the Mesozoic.

Mammal evolutionary progression is below:

  • Jawless fish: Cambrian period to mid Ordovician periods
  • Bony fish: mid-Ordovician period to late Devonian period
  • Amphibians: late Devonian period to early Carboniferous period
  • Reptiles: late Carboniferous period
  • Pelycosaurs (synapsids, or "mammal-like reptiles"): late Carboniferous period to very early Triassic period
  • Cynodonts: Permian-Triassic
  • Mammals: mid-Triassic period to today

Read more at Wikipedia.org


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(F302-4) Genuine Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd(F302-4) Genuine Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd $14.99 Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, Oligoc T478Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, Oligoc T478 $39.95
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Florida Fossil LotFlorida Fossil Lot $15.00 Nice Bison Molar Tooth Florida Fossils Teeth Jaw Bones Antiquus Horse Equus BoneNice Bison Molar Tooth Florida Fossils Teeth Jaw Bones Antiquus Horse Equus Bone $25.00
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Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age'Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age' $20.00 Fossil Tapir metapodial foot toe bone Tapirus veroensis Pleistocene FloridaFossil Tapir metapodial foot toe bone Tapirus veroensis Pleistocene Florida $20.00
Choice Three Toed Horse Molar Tooth Florida Fossils Extinct Ice Age Skull TeethChoice Three Toed Horse Molar Tooth Florida Fossils Extinct Ice Age Skull Teeth $30.00 Outstanding High Quality Deer Antler Florida Saltwater Fossil MammalOutstanding High Quality Deer Antler Florida Saltwater Fossil Mammal $17.30
Florida Fossil Mammal Skull Fragment LotFlorida Fossil Mammal Skull Fragment Lot $20.00 Fossil Bison Jaw Bones Teeth Extinct Ice Age Buffalo Skull Ia {j5}Fossil Bison Jaw Bones Teeth Extinct Ice Age Buffalo Skull Ia {j5} $60.00
Juvenile Oreodont Maxilla, Eporeodon Fossil, Badlands, South Dakota, Oligo O1180Juvenile Oreodont Maxilla, Eporeodon Fossil, Badlands, South Dakota, Oligo O1180 $34.95 World Class Llama Molar From Leisey Shell Pit Florida Fossils Extinct Ice Age FlWorld Class Llama Molar From Leisey Shell Pit Florida Fossils Extinct Ice Age Fl $45.00
Fossil Bison Bones Teeth Extinct Ice Age Buffalo Skull Ia {hjaa4}Fossil Bison Bones Teeth Extinct Ice Age Buffalo Skull Ia {hjaa4} $55.00 New listing
		vintage tusk piece of unknown mammalNew listing vintage tusk piece of unknown mammal $15.99
Fossilized Whale Inner Ear Bone~ South Carolina, Usa~ Xxl~ 4.20" 11.2 Oz.Fossilized Whale Inner Ear Bone~ South Carolina, Usa~ Xxl~ 4.20" 11.2 Oz. $33.65 Was:  Previous Price $49.49 Geological Enterprises Eocene Fossil Homogalax tooth in bone, WyomingGeological Enterprises Eocene Fossil Homogalax tooth in bone, Wyoming $16.99
Amazing Old Animal Paw Fossil- North Florida 3" Long 2" WideAmazing Old Animal Paw Fossil- North Florida 3" Long 2" Wide $30.00 Ice Age Cave Bear Limb Bone Fossil Romania with Display Label Pleistocene AgeIce Age Cave Bear Limb Bone Fossil Romania with Display Label Pleistocene Age 00006000 $20.00
Fossil Prehistoric Horse Tooth Teeth Mammal Equus 3" cab Horse Teeth JewelryFossil Prehistoric Horse Tooth Teeth Mammal Equus 3" cab Horse Teeth Jewelry $19.95 Fossil Rodant Jaw South DakotaFossil Rodant Jaw South Dakota $32.00
Paranthropus Robustus Skull Reproduction Anthropology Fossil Human EvolutionParanthropus Robustus Skull Reproduction Anthropology Fossil Human Evolution $29.99 New listing
		Prehistoric Camel Tooth Pleistocene Van Buren County Iowa #2New listing Prehistoric Camel Tooth Pleistocene Van Buren County Iowa #2 $19.99
Lot Of 11 Fossil Jaws With Teeth Miocene Extinct Assorted Artiodactyla SpeciesLot Of 11 Fossil Jaws With Teeth Miocene Extinct Assorted Artiodactyla Species $15.50 Geological Enterprises Oligocene fossil Miniochoerus gracilis jaw sectioinGeological Enterprises Oligocene fossil Miniochoerus gracilis jaw sectioin $15.99
Fossil Tapir CollectionFossil Tapir Collection $90.00 Fossil Baleen Whale skull section maxilla jaw Miocene Bakersfield cetaceanFossil Baleen Whale skull section maxilla jaw Miocene Bakersfield cetacean $80.00
5 High Quality Colorful Mastodon Tooth Partials Florida Fossil Mammal Teeth5 High Quality Colorful Mastodon Tooth Partials Florida Fossil Mammal Teeth $25.00 Mastodon Tooth Baby Fossil Replica Elephant Woolly Mammoth Ancestor Extinct NewMastodon Tooth Baby Fossil Replica Elephant Woolly Mammoth Ancestor Extinct New $12.95
Fossil Oligocene Mammal lot South DakotaFossil Oligocene Mammal lot South Dakota $10.00 Fossil Whale Vertebrae Lot from the Ernst Quarry: Bakersfield, CaliforniaFossil Whale Vertebrae Lot from the Ernst Quarry: Bakersfield, California $74.99
Rare Glyptodon Spike Scute Florida Fossils Osteoderm Bones Giant Armadillo ToothRare Glyptodon Spike Scute Florida Fossils Osteoderm Bones Giant Armadillo Tooth $45.00 Unusual Odontocete Shark Tooth Whlae Tooth    0196Unusual Odontocete Shark Tooth Whlae Tooth    0196 $32.00
Rare Giant Tortoise Claw Core Florida Fossils Extinct Turtle Bones Shell Tooth @Rare Giant Tortoise Claw Core Florida Fossils Extinct Turtle Bones Shell Tooth @ $20.00 Quality Llama Molar From Leisey Shell Pit Florida Fossils Extinct Ice Age CamelQuality Llama Molar From Leisey Shell Pit Florida Fossils Extinct Ice Age Camel $25.00
Large Inner Ear Bone Fossil Whale Mammal 4 1/4 " Megalodon Era Shark Food WhaleLarge Inner Ear Bone Fossil Whale Mammal 4 1/4 " Megalodon Era Shark Food Whale $29.95 Fossil Horse Three Bone SetFossil Horse Three Bone Set $65.00
Fossil Giant Armadillo phalange phalanx toe Holmesina septentrionalis FloridaFossil Giant Armadillo phalange phalanx toe Holmesina septentrionalis Florida $15.00 Uncommon Rabbit Calcaneum Florida Fossils Sylvilagus Bones Tooth Teeth Rodent FlUncommon Rabbit Calcaneum Florida Fossils Sylvilagus Bones Tooth Teeth Rodent Fl $15.00
Oligocene Fossil Partial Mammal Skull Braincase White River Badland NebraskaOligocene Fossil Partial Mammal Skull Braincase White River Badland Nebraska $10.00 Fossilized Mammoth BoneFossilized Mammoth Bone $25.00
Hyracodon Rhino Jaw White River Formation NebraskaHyracodon Rhino Jaw White River Formation Nebraska $25.00 Horse Calcaneum, Pliocene, Nebraska/South Dakota 89.9 gramsHorse Calcaneum, Pliocene, Nebraska/South Dakota 89.9 grams $20.00
Prehistoric Whale Vertebrae Bone Fossil 3” X 3”Prehistoric Whale Vertebrae Bone Fossil 3” X 3” $75.00 Fossilized Dinosaur Tooth in Stone Matrix - $7 s/hFossilized Dinosaur Tooth in Stone Matrix - $7 s/h $9.00
Lot of 2 Woolly Mammoth Rib Fossil Bone Ice Age Pleistocene Wooly Tooth ExtinctLot of 2 Woolly Mammoth Rib Fossil Bone Ice Age Pleistocene Wooly Tooth Extinct $99.00 Choice Sloth Tooth Florida Fossils Teeth Claw Core Ice Age Extinct Skull Bones @Choice Sloth Tooth Florida Fossils Teeth Claw Core Ice Age Extinct Skull Bones @ $45.00
Spinosaurus Dinosaur Fossil Tooth In Glass Top Riker Display Case Morocco AfricaSpinosaurus Dinosaur Fossil Tooth In Glass Top Riker Display Case Morocco Africa $35.00 Poebrotherium, Upper and Lower Sections, Early Camel Fossils, South Dakota, P285Poebrotherium, Upper and Lower Sections, Early Camel Fossils, South Dakota, P285 $10.95
Fossil Whale Vertebra, Miocene, 5.3-23 Myo, Venice Beach, FlFossil Whale Vertebra, Miocene, 5.3-23 Myo, Venice Beach, Fl $24.00 Oreodont Jaw Section # 1804 • 3 teeth/2.0" sectionOreodont Jaw Section # 1804 • 3 teeth/2.0" section $9.95
Fossil Whale Cervical Vertebra, Miocene, 5.3-23 Myo, Venice Beach, FlFossil Whale Cervical Vertebra, Miocene, 5.3-23 Myo, Venice Beach, Fl $24.00 Extinct Woolly Mammoth Hair Pendant KeychainExtinct Woolly Mammoth Hair Pendant Keychain $14.95
Unusual Fossil Capybara Snout Partial Skull Florida Fossils Unusual Fossil Capybara Snout Partial Skull Florida Fossils  $75.00 2 Knife Scales Stabilized Pleistocene Fossil Yakutia River Siberian 1/4” Plus2 Knife Scales Stabilized Pleistocene Fossil Yakutia River Siberian 1/4” Plus $85.00
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Fossilized African Mosasaur Real Dinosaur Fossil Tooth In Matrix Morocco, AfricaFossilized African Mosasaur Real Dinosaur Fossil Tooth In Matrix Morocco, Africa $50.00 Large fossil Allodesmus tooth molar Miocene Shark Tooth Hill BakersfieldLarge fossil Allodesmus tooth molar Miocene Shark Tooth Hill Bakersfield $38.99
Primigenius Ice Age Woolly Mam Tooth Slice Fossil T3Primigenius Ice Age Woolly Mam Tooth Slice Fossil T3 $24.95 tooth fossiltooth fossil $81.00
6 Fossil Horse Teeth Florida Paleontology Antique Specimen Education Curio Ht16 Fossil Horse Teeth Florida Paleontology Antique Specimen Education Curio Ht1 $16.95 Rare Small Woolly Mammoth Tooth Rare extinct Genuine Ice Age Fossil Se UsaRare Small Woolly Mammoth Tooth Rare extinct Genuine Ice Age Fossil Se Usa $84.71
New listing
		Prehistoric Bison Tooth Pleistocene Van Buren County IowaNew listing Prehistoric Bison Tooth Pleistocene Van Buren County Iowa $19.99 Detailed Glyptodon Spike Scute Florida Fossils Bones Extinct Giant Armadillo FlDetailed Glyptodon Spike Scute Florida Fossils Bones Extinct Giant Armadillo Fl $45.00
Basilosaurus isis (King Lizard) Premolar tooth, from Morocco #1Basilosaurus isis (King Lizard) Premolar tooth, from Morocco #1 $79.99 Set of 5 Fossil Deer Teeth , Odocoileus Virginianus, FloridaSet of 5 Fossil Deer Teeth , Odocoileus Virginianus, Florida $10.00
Detailed Short Faced Bear Molar Florida Fossils Spectacled Canine Tooth Teeth FlDetailed Short Faced Bear Molar Florida Fossils Spectacled Canine Tooth Teeth Fl $45.00 ~ 1 inch Otodus Sharks Tooth in Matrix from Morocco~ 1 inch Otodus Sharks Tooth in Matrix from Morocco $4.00
Fossil Bone Fossilized Huge VertebraeFossil Bone Fossilized Huge Vertebrae $85.00 Ice Age Horse Tooth Equus ferrus caballus Doggerland-Brownbank, North SeaIce Age Horse Tooth Equus ferrus caballus Doggerland-Brownbank, North Sea $25.00
Fossilized Oreodont partial Jaw Teeth please see photosFossilized Oreodont partial Jaw Teeth please see photos $59.77 Fossilized Whale Inner Ear Bone~ South Carolina, Usa~ 3.35" 5.2 Oz.Fossilized Whale Inner Ear Bone~ South Carolina, Usa~ 3.35" 5.2 Oz. $20.94 Was:  Previous Price $30.79
New listing
		Fossils/ Lot of misc. bones & pieces Mosasaur and others Cretaceous 17 specimensNew listing Fossils/ Lot of misc. bones & pieces Mosasaur and others Cretaceous 17 specimens $16.00 Fossil Red Deer tibia Cervus elaphus Pleistocene GermanyFossil Red Deer tibia Cervus elaphus Pleistocene Germany $30.00
Excellent Multicolored Camel Incisor Tooth Florida Fossil Mammal TeethExcellent Multicolored Camel Incisor Tooth Florida Fossil Mammal Teeth $20.00 Megalodon Teeth Lot Fossils Shark #15652 18oMegalodon Teeth Lot Fossils Shark #15652 18o $39.99
Partial Gompotherium Tooth, Early Miocene to late Pliocene, So. Carolina 214 grPartial Gompotherium Tooth, Early Miocene to late Pliocene, So. Carolina 214 gr $32.00 Homo Ergaster Skull Reproduction Anthropology Fossil Human EvolutionHomo Ergaster Skull Reproduction Anthropology Fossil Human Evolution $35.00
Beautiful Jet Black Petrified Bear Jaw Florida Saltwater Fossil MammalBeautiful Jet Black Petrified Bear Jaw Florida Saltwater Fossil Mammal $45.00 Rare Giant Armadillo Patella Knee Cap Florida Fossils Glyptodon Bones Tooth JawsRare Giant Armadillo Patella Knee Cap Florida Fossils Glyptodon Bones Tooth Jaws $35.00
Pleistocene fossil Equus bone Valley Peace River FloridaPleistocene fossil Equus bone Valley Peace River Florida $20.00 Record Size Giant Tortoise Spur Florida Fossils Turtle Bones Osteoderm Skull FlRecord Size Giant Tortoise Spur Florida Fossils Turtle Bones Osteoderm Skull Fl $35.00
Large Woolly Mammoth Tooth Teeth 4.5 pounds Roots Bone check the picturesLarge Woolly Mammoth Tooth Teeth 4.5 pounds Roots Bone check the pictures $99.77 Early Camel Jaw Section, Poebrotherium Fossil, Badlands South Dakota, Oligo P329Early Camel Jaw Section, Poebrotherium Fossil, Badlands South Dakota, Oligo P329 $8.95
Oreodont Partial SkullOreodont Partial Skull $30.00 Unusual Fossil Stingray Mouthplate Shark Tooth Hill Fossils 0104 Unusual Fossil Stingray Mouthplate Shark Tooth Hill Fossils 0104  $49.00
Large Silver Wire Wrapped Fossil Moroccan Shark Teeth tooth Necklace 25 pcsLarge Silver Wire Wrapped Fossil Moroccan Shark Teeth tooth Necklace 25 pcs $27.95 Fossil Woolly Mammoth Tooth Teeth Pleistocene Ice Age Beaufort Sc  Fossil Woolly Mammoth Tooth Teeth Pleistocene Ice Age Beaufort Sc   $75.00
Horse Fossils.Horse Fossils. $10.00 Super Fossil Camel Toe Bone Florida Fossils  0111Super Fossil Camel Toe Bone Florida Fossils  0111 $22.00
Rare Early Miocene Camelid Toe Bone Florida Fossils  0112Rare Early Miocene Camelid Toe Bone Florida Fossils  0112 $29.00 Super Colorful Tapir Tooth Florida Fossils Teeth Jaw Bones Extinct Skull Ice AgeSuper Colorful Tapir Tooth Florida Fossils Teeth Jaw Bones Extinct Skull Ice Age $15.00
Horse Ankle Bone, Astragalus, Pliocene, Nebraska/South Dakota 43.2 grams 1-5/8"Horse Ankle Bone, Astragalus, Pliocene, Nebraska/South Dakota 43.2 grams 1-5/8" $15.00 Fossilized Oreodont Lower Jaw Montana Usa Region 30 MyaFossilized Oreodont Lower Jaw Montana Usa Region 30 Mya $68.00
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