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mammalia    
n. 哺乳类

哺乳类

Mammalia
n 1: warm-blooded vertebrates characterized by mammary glands in
the female [synonym: {Mammalia}, {class Mammalia}]

Mammalia \Mam*ma"li*a\, n. pl. [NL., from L. mammalis. See
{Mammal}.] (Zool.)
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.
[1913 Webster]

Note: Mammalia are divided into three subclasses;
[1913 Webster] I. {Placentalia}. This subclass embraces
all the higher orders, including man. In these the
fetus is attached to the uterus by a placenta.
[1913 Webster] 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.
[1913 Webster] 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 mammae.
[1913 Webster]


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  • Mammal - Wikipedia
    A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia ( məˈmeɪli ə ) Mammals are characterised by the presence of milk -producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones
  • Mammal | Definition, Characteristics, Classification, Examples, Facts . . .
    mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother In addition to these characteristic milk glands, mammals are distinguished by several other unique features
  • MAMMALIA Definition Meaning | Merriam-Webster Medical
    The meaning of MAMMALIA is the highest class of the subphylum Vertebrata comprising humans and all other animals that nourish their young with milk secreted by mammary glands, that have the skin usually more or less covered with hair, a mandible articulating directly with the squamosal, a chain of small ear bones, a brain with four optic lobes
  • Mammals – Definition, Examples, Characteristics
    What Is a Mammal? A mammal is a vertebrate animal that belongs to the class Mammalia This group has several distinct features: Warm-blooded Metabolism: Mammals maintain a constant body temperature regardless of the environment In other words, they are endothermic animals Hair or Fur: All mammals have some hair at some point in their lives
  • Mammals (Mammalia) - Know Your Mammals
    Mammals, scientifically known as Mammalia, represent a fascinating and diverse class of animals characterized by their warm-blooded nature, hair or fur, and the ability to nurse their young through mammary glands
  • What Are Mammals? Definition, Characteristics - Zoologyverse | 2025
    Mammals are an incredibly diverse group of vertebrates that occupy nearly every habitat on Earth Their evolution, complex behaviors, and unique physical traits have made them one of the most fascinating classes in the animal kingdom
  • Mammal Diversity - Burke Museum
    The Class Mammalia evolved later in the history of life on Earth, in the early Mesozoic, about 210 million years ago Today we find mammals across all of Earth’s continental land masses, on the ground, in the ground, above the ground, and in the air, as well as throughout the oceans
  • Mammal classification - Wikipedia
    Over 70% of mammal species are in the orders Rodentia, Chiroptera, and Eulipotyphla Mammalia is a class of animal within the phylum Chordata Mammal classification has been through several iterations since Carl Linnaeus initially defined the class
  • Mammal - Classification, Class Mammalia, Monotremes, Marsupials . . .
    The higher classification of the class Mammalia is based on consideration of a broad array of characters





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