BIO356H5 Lecture 8: lecture 8

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7 May 2011
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If there"s 7 or 8 characters, not going to ask to list all of them. As long as you have a sense of what character traits diagnose a particular group (like one good character trait or something prof emphasized) then focus on that. Lepospondyls- group that includes the microsaurs (recall: initially thought of as a reptile but realized it"s not- just a specialized amphibian); will spend quite bit of time on lepospondyls. In lepospondyls, they look like a spool of thread (very different)- still hollow. Lepospondyl diversity- fairly diverse; 3 major groups: aistopoda, nectridea and microsauria; In tail region which tends in amphibians to be fairly flat, even in short tail amphibians. In these, the tails have become cylindrical and pointy. Nectrideans- also elongate but unlike the aistopods, they still retained limbs (very small but still have limbs); extend from lower pensylvanian to lower permian ( so something existed in. Lower permian to wipe out the leponspondyls at the time)

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