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Thread: Phylogenetic Tree

  1. #1 Phylogenetic Tree 
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    Hey everyone, I recently wrote a paper on the platypus and all of the discussion throughout science regarding its classification. Upon completion of the paper I decided to include a short phylogenetic tree including the evolutionary relationships between birds, reptiles, placental mammals. marsupials, and monotremes but I am having difficulty putting it together, as I am not sure of the order they should go in. Right now I have Reptiles at the top with eggs as their characteristic, followed by birds with warm blood and a four chambered heart, followed by the class of Placental mammals with mammary glands containing monotremes which do not give birth to live young followed by marsupials which give birth to live, but underdeveloped youth. Do any of you have suggestions for reordering or different classifications to use? Any help is appreciated.


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  3. #2 Re: Phylogenetic Tree 
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    Quote Originally Posted by Jordan798
    Hey everyone, I recently wrote a paper on the platypus and all of the discussion throughout science regarding its classification. Upon completion of the paper I decided to include a short phylogenetic tree including the evolutionary relationships between birds, reptiles, placental mammals. marsupials, and monotremes but I am having difficulty putting it together, as I am not sure of the order they should go in. Right now I have Reptiles at the top with eggs as their characteristic, followed by birds with warm blood and a four chambered heart, followed by the class of Placental mammals with mammary glands containing monotremes which do not give birth to live young followed by marsupials which give birth to live, but underdeveloped youth. Do any of you have suggestions for reordering or different classifications to use? Any help is appreciated.
    What's the basis of the phylogeny? You seem to be talking about gross morphological traits, which is probably not the best way to approach the problem unless you're very careful about discerning homologous traits from analogous or convergent ones. Example being the bill itself, which is a convergent trait rather than being a homologue of the beaks of birds. You might be better off looking at cladistic studies with a genetic basis?


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  4. #3  
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    (Amniotes)--------------------Lizards
    l l
    l l
    l l----------Birds
    l l
    l l---------Crocodiles
    l
    -------(Synapsids)-----------------------------------Placental mammals
    l l
    l l
    l l--------Marsupials
    l
    l----Monotremes
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  5. #4  
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    It looked better in the preview
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  6. #5  
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    Hello everyone.
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