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"Nitro"
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sicentificly I belive the difference is a special set of teeth that one species has that the other dosen't.I wish I know more, im just trying to remember what frank said.other than that you have to look at the shape of the fish.
 

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I Have No Fish but I Have Japanese Girls On My Ava
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I would have to say shape as the best thing to aesily describe the different features bewteen Pygos and Serras. Pygos have a close oval shape, while Serras have high, or some say lumpy, backs.
 

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"Nitro"
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5,386 Posts
here it is. this is the only true way to determine a pygo from a serr

QUOTE
BDKing57 Posted on Apr 8 2003, 11:41 AM
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...they said they removed the jaw... and they believed it to be pygo, which clearly doesnt look so, but is it possible the fish only had one row of teeth inside?
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I meant to discuss this with you regarding the ectopterygoid teeth. These are teeth that sit inside the roof of the mouth. Depending on non-Pygocentrus species or non-Pygopristis, there is usually 2 to 6 tiny teeth
 
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