Its called gynandromorph and is rare but happens in a lot of different animals
Awesome to see it in Ts. I like the P. sp. lowland with it in the results you showed
I had seen it before in insects but I had no idea it could even happen in birds!! Sooo interesting!
Is this the one you are talking about?
Aye, that's the one. They preserved the specimen when it died.
This is what I'm curious about as well.
This is my opinion and I could be wrong, eh, but personally I think that those really extremely rare events puts an invisible 'expiration date' on the bugger, so I wouldn't expect at all the lifespan of an average (and healthy) L.nigerrimum 0.1
It's not a mutation, at least not in the genetic sense of the word. When cells are dividing in very early embryonal developement the sex chromosomes get divided unequally between the two daughter cells, so one ends up with a female set of chromosomes and one with a male. Most spiders have an X0 system of sex chromosomes and no Y, meaning females have two X, males have one X. If one very early cell loses one X in a bad mitosis the originally female cell becomes male while the other cell from that mitosis stays female. The cells go on dividing and form each one half of the tarantula. When this happens in a cell at a later embryonal stage you have sexual mosaicism. Just in case anyone wanted to know...
All I can see is a ton of ball python breeders spazzing out to get one so they can market it as the first tarantula "morph".