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Monotremata    
單孔目

單孔目

Monotremata
n 1: coextensive with the subclass Prototheria [synonym:
{Monotremata}, {order Monotremata}]

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]


Monotremata \Mon`o*trem"a*ta\, n. pl. [NL., fr. Gr. mo`nos
single ? hole.] (Zool.)
A subclass of Mammalia, having a cloaca in which the ducts of
the urinary, genital, and alimentary systems terminate, as in
birds. The female lays eggs like a bird. See {Duck mole},
under {Duck}, and {Echidna}.
[1913 Webster]

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