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What is a platypus?
by fishboy
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x fishboy   - at 6:45 pm on Wednesday February 23 2005 x
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x What is a platypus?

The latest in monotreme genetics has indicated that the platypus has 10 sex-linked chromosomes (X_X_X_X_X_). Placental mammals have two sex-linked chromosomes (X_). Birds have 40 to 80 sex-linked chromosomes. Most reptiles do not have sex-linked chromosomes, but rely on temperature during incubation to dictate what gender the offspring will be.

Currently, platypuses are categorized as mammals. They are furry, warm-blooded (though they possess a blood temperature much lower than other mammals) quadripeds. However, they are egg-laying, have a ducklike bill, and possess no mammary glands. So what is a platypus?

Poll: What is a platypus?
0 %  mammal
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0 %  bird
x 0 % - answer2
0 %  therapsid
x 0 % - answer3
0 %  its own class
x 0 % - answer4
0 %  leave the poor kid alone, it's got enough problems
x 0 % - answer5
You voted for Nothing - You need to sign up first | Last vote at 2:59 pm on Friday April 15 2005

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x Unread post xUniversal Sea   - at 6:58 pm on Wednesday February 23 2005 x
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x Universal Sea I'd say Fish in honour of Fishboy.
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x Unread post xJess   - at 7:12 pm on Wednesday February 23 2005 x
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x Jess it's a pseudomammal!
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x Unread post xBilly_Tascademo   - at 11:25 am on Monday February 28 2005 x
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x Billy_Tascademo What's a "therapsid"?

Sounds like an uncomfortable lumbar puncture type deal.
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x Unread post xJess   - at 11:35 am on Monday February 28 2005 x
x In this installment of x
x Jess I looked it up and it's a sort of "protomammal"

A mammal before there were mammals.

  

Therapsids are often referred to as mammal-like reptiles. They have teeth similar to mammals. They have a stance similar to mammals (limbs pulled under the body - a more efficient body plan). Some even speculate that some latter therapsids had hair, but the only evidence of skin in a therapsid comes from a hairless, more primitive species from the end of the Permian, millions of years before therapsids went extinct. In all likelihood therapsids were endotherms and they occupied a diverse array of habitats, so it probably is likely that at least some had hair. Therapsids also provide one of the most compelling bits of evidence for evolution. Later cynodont therapsids like Probainognathus and Diarthrognathus have the primitive quadrate - articular jaw joint found in all other vertebrates AND the dentary - squamosal jaw joint found only in mammals. These represent the most interesting intermediate fossils ever found. Today, mammals are included as a subgroup of the therapsids.

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x Unread post xBilly_Tascademo   - at 11:31 am on Wednesday March 2 2005 x
x Nice One... x
x Billy_Tascademo Lets play....aaaaaaaaaaaaask Jess!
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x Unread post xjj_4487   - at 4:42 am on Saturday March 12 2005 x
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x jj_4487 I'm not sure if it varies from species to species of platypus. I'm pretty sure that the platypus is a mammal - the duck-billed platypus, which is definately a mammal. The platypus is a uniquely Australian animal, one of the two mammals found on Earth which lays eggs. It shows several mammilian characteristics - it is a vertebrate, shows homeostatic adaptions (amongst many it is warm-blooded), and I think, it lactates to provide its young with milk. But I'm not too sure about the last point.
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x Unread post xJess   - at 12:15 pm on Saturday March 12 2005 x
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x Jess I think maybe the "mamm" in mammal refers to mammary glands. Though that's really just a guess on my part.
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Edited by Jess on March 12 2005 at 11:15 am
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x Unread post xfishboy   - at 11:07 pm on Tuesday April 5 2005 x
x platypus milk x
x fishboy   

the female platypus does lactate from mammary glands, but the milk is secreted through skin patches in lieu of nipples

and that's one to grow on

><)))>
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x Unread post xJess   - at 1:57 am on Thursday April 7 2005 x
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x Jess amazing..

We humans are so primitive. I wish I could lay eggs rather than gestate. Would makes things SO much easier.
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x Unread post xxjeffwith1f   - at 11:18 am on Tuesday April 12 2005 x
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x jeffwith1f Efveryone knows that a Platypus is just a Beaver in disguise.
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x Unread post xAudioHeaven   - at 3:01 pm on Friday April 15 2005 x
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x AudioHeaven I think they're cute. When they were first discovered, no one believed they were a real animal.

http://www.talkorigins.org/faqs/platypus.html

Some stuff here.
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