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Mammalia

Mammalia

(Science: zoology) 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 foetus 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 mammae.

Origin: NL, from L. Mammalis. See mammal.


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Re: Pentadactyl limb....

... tetrapods. The class amphibian, reptile, aves (birds), and mammals fall under this superclass tetrapods. The order primates fall under the class mammalia (mammals). So primates are mammals and they are Pentadactyl.

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by Jean1Mack
Fri Mar 21, 2014 6:55 pm
 
Forum: Zoology Discussion
Topic: Pentadactyl limb....
Replies: 7
Views: 3995

Book recommendation for exam

... 15. Reptilia : Origin of reptiles; skull types; status of Sphenodon and crocidiles. 16. Aves : Origin of birds; flight adaptation, migration. 17. Mammalia : Origin of mammals; denitition; general features of egg-laying mammals, pouched-mammals, aquatic mammals and primates; endocrine glands and ...

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by bertstare
Sun Oct 21, 2012 2:19 pm
 
Forum: Zoology Discussion
Topic: Book recommendation for exam
Replies: 3
Views: 4756

Why bronchial circ. dumps deoxygenated blood in2 L. atrium?

... but still oxygenated blod goes into left, and deoxygenated into right atrium. Reptiles - only crocodiles have, just like Aves(birds) and Mammalia, two atriums, and two ventricles. And again, oxygenated blood goes into left atrium, deoxygenated into right atrium. So, I don't know where ...

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by miloshic
Fri Jan 30, 2009 2:16 pm
 
Forum: Human Biology
Topic: Why bronchial circ. dumps deoxygenated blood in2 L. atrium?
Replies: 8
Views: 6886

Chipmunk: Species identification

i got it -Animalia: Muticelluar heterotrophs that use oxygen and can reproduce sexually. -Chordata: Notochords and nerve chords -Mammalia: middle ear bones, hair, mammary glands -Rodentia: specialized teeth -Sciuridae: skull structure -Tamias: pouched cheeks

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by nbenvenuto
Tue Mar 04, 2008 2:06 am
 
Forum: Zoology Discussion
Topic: Chipmunk: Species identification
Replies: 3
Views: 4496

Chipmunk: Species identification

Hi, i looked every where for the characterics of why the Hopi Chipmunk are in these taxons: Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia Family: Sciuridae Genus: Tamias Species: T. rufus ...can you guys help me out on this please!

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by nbenvenuto
Mon Mar 03, 2008 11:10 pm
 
Forum: Zoology Discussion
Topic: Chipmunk: Species identification
Replies: 3
Views: 4496
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