Four digits on the Forelimb
The picture shows the forelimb of a modern newt. You can clearly see
that it only has 4 digits. The same is correct for the temnospondyls.
The newts are part of the Lissamphibia which are related to the
temnospondyls as neither group are amniotes yet still tetrapods.In some
of the pictures on this site you may notice that the forelimbs actually
show 5 digits. Even some of the skeletons have had the 5'th digit added
on in the lab despite there not being one found. These are common
mistakes and experts are all now in agreement that the temnospondyls
had 4 digits ,except for very few cases where one specimen turned up
with 5 digits. This is probably due to a random mutation, similar to
those seen in humans with 6 fingers.
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