• WordNet 3.6
    • n Mammalia warm-blooded vertebrates characterized by mammary glands in the female
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Webster's Revised Unabridged Dictionary
    • n. pl Mammalia (Zoöl) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother.☞ Mammalia are divided into three subclasses; I. Placentalia. This subclass embraces all the higher orders, including man. In these the fetus is attached to the uterus by a placenta. II. Marsupialia. In these no placenta is formed, and the young, which are born at an early state of development, are carried for a time attached to the teats, and usually protected by a marsupial pouch. The opossum, kangaroo, wombat, and koala are examples. III. Monotremata. In this group, which includes the genera Echidna and Ornithorhynchus, the female lays large eggs resembling those of a bird or lizard, and the young, which are hatched like those of birds, are nourished by a watery secretion from the imperfectly developed mammæ.
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Century Dictionary and Cyclopedia
    • mammalia In zoology, the highest class of Vertebrata, containing all those animals which suckle their young, and no others; mammiferous animals; the mammals. With the exception of the lowest subclass, the monotremes or Ornithodelphia, which lay eggs like birds, Mammalia are viviparous, bringing forth their young alive; and, with the same exception, the mammary gland is provided with a nipple for the young to suck. They have no gills, but breathe air by means of lungs, which are primitively an offset of the alimentary canal. The blood is warm; the heart is completely four-chambered or quadrilocular, with two auricles and two ventricles; and its right and left sides are entirely separate after birth, when the arterial and venous circulation and the pulmonary and systemic vessels become differentiated. The heart and lungs are situated in the thoracic cavity, which is completely shut off from the abdomen by a muscular diaphragm. The aorta is single and sinistral, curving over the left bronchus. The blood contains red circular non-nucleated blood-disks and white blood-corpuscles. The brain has large cerebral hemispheres, which are more or less extensively united by commissures, especially by a corpus callosum, which when well developed roofs over more or less of the lateral ventricles. The skull has two occipital condyles and an ossified basioccipital. The lower jaw, composed of a pair of simple mandibular rami, is directly articulated by a convex condyle with the glenoid fossa of the squamosal. The malleus and incus become specialized auditory ossicles, lodged like the stapes in the cavity of the tympanum. (See Malleifera.) Limbs are always present. There are ordinarily two pairs, anterior and posterior, or pectoral and pelvic, but the latter are sometimes aborted, as in cetaceans and sirenians. The anklejoint, if there is one, is always formed between crural and tarsal bones, and is never mediotarsal. The body is usually more or less hairy, sometimes naked, rarely scaly or with a bony exoskeleton. The class Mammalia is definitely circumscribed, no transitional forms being known. It has been subdivided in various ways. Linnæus had 7 orders, Primates, Bruta, Ferœ, Glires, Pecora, Belluœ, and Cete, with 40 genera in all. Cuvier made the 9 orders Bimana, Quadrumana, Carnaria, Marsupiata, Rodentia, Edentata, Pachydermata, Ruminantia, and Cetacea. Owen divided Mammalia primarily into 4 subclasses, according to the character of the brain, and 14 orders, as follows: Archencephala—Bimana; Gyrencephala—Quadrumana, Carnivora, Artiodactyla, Perissodaclyla, Proboscidia, Sirenia, Cetacea; Lissencephala—Bruta, Chiroptera, Insecliuora, Rodentia; Lyencephala—Marsupialia, Monotremata. Dana's prime divisions correspond to Owen's by other names, Archontia, Megasthena, Microsthena, and Oöticoidea. In 1872 Gill arranged mammals in 3 subclasses and 14 orders, as follows: subclass Monodelphia. containing all placental mammals, orders Primates, Ferœ, Ungulata, Toxodontia (fossil), Hyracoidea. Proboscidea, Sirenia, Cete, in one series Educabilia, and Chiroptera, Insectivora, Glires, Bruta, in a second series Ineducabilia; subclass Didelphia, the implacental mammals, order Marsupialia alone; subclass Ornithodelphia, the oviparous mammals, order Monotremata alone. This is substantially the classification now almost universally current, but it is exclusive of certain fossil groups which require ordinal rank. The families of mammals now recognized are about 150 in number, the genera nearly 1,000; the living species are about 3,250. Remains of mammals abound in all Tertiary deposits, and a few forms have been found in Mesozoic beds. Also called Mammifera and Malleifera.
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Chambers's Twentieth Century Dictionary
    • Mammalia mam-mā′li-a (zool.) the whole class of animals that suckle their young
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Webster's Revised Unabridged Dictionary
NL., from L. mammalis,. See Mammal
Chambers's Twentieth Century Dictionary


In literature:

We know more about the feathered tribes than the mammalia of Mexico.
"The Western World" by W.H.G. Kingston
The sea, near the coast and in the bays, abounds in fish and in mammalia.
"A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2" by Otto von Kotzebue
In the third, or principal room, will be found a nearly complete series of the QUADRUMANA or four-handed Mammalia.
"Heads and Tales" by Various
The mammalia are not very numerous.
"Travels in Peru, on the Coast, in the Sierra, Across the Cordilleras and the Andes, into the Primeval Forests" by J. J. von Tschudi
There is also, in at least the mammalia, a typical number of vertebrae in the neck.
"The Testimony of the Rocks" by Hugh Miller
Three species of mastodon and the gigantic megatherium were the only extinct mammalia known from South America previous to Darwin's voyage.
"Life of Charles Darwin" by G. T. (George Thomas) Bettany
None of the mammalia possess this facility.
"Man And His Ancestor" by Charles Morris
Alcohol, acids, and the stomach of any of the mammalia coagulate it; and it is also soluble in water.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
Monkeys belong to the liveliest and most active of the mammalia.
"Happy Days for Boys and Girls" by Various
The winged mammalia have not usually very wide ranges, there being only one bat common to the Old and New Worlds.
"Island Life" by Alfred Russel Wallace

In poetry:

As the small opossum held in pouch maternal
Grasps the nutrient organ whence the term mammalia,
So the unknown stranger held the wire electric,
Sucking in the current.
"De Sauty" by Oliver Wendell Holmes

In news:

Chordata Class: Mammalia Order: Carnivora Family: Ursidae Genus: Ursus.
Chordata Class: Mammalia Order: Rodentia Family: Sciuridae Genus: Cynomys.

In science:

Outside of astronomy, in 1874 Gore also published a ―Glossary of Fossil Mammalia for the Use of Students of Palaeontology‖ (137).
John Ellard Gore: of immensity and minuteness