One-fingered two-toed amphiuma

[Chamaeleo]

This week I managed to buy 2 A. means, one of the species I wanted a long time ago :happy:. I'm not sure about their sex, they are only ~40 cm. Not this is the interesting, but the following: one of them on its forelimbs has only 1 finger (and the hindlimbs are a bit smaller than the other's too). Did anyone observe or did anyone hear about similar thing?

 

[Chamaeleo]

Here is a photo about the one-fingered A. means:

 

[Infamous82]

Are both of the aphmiumas the samle color? It would either be due to an injury, or more than likely what you have is a one-toed amphiuma.

 

[Chamaeleo]

Yes, their colouration is the same. It's 100% that both of them are means, the one-fingered animal is larger than 50 cm now, and none of them have more than two digits on each limb. So they can't be neither pholeter, nor tridactylum.There is no sign of injury, I think it's a simple mutation, I only wanted to know how frequent this is.
Here is a photo about the other one: