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They were sold to me as 'black venezuela' and I was told that it wasn't sure if it was a new species or a colour mutation of an already known one. I was hoping somebody here could give me some more insight on this.

Thanks in advance!

Hi,

the name 'black venezuela' is nonsense, better call it Corydoras aeneus "Black" or Corydoras schultzei "Black".
Your cory is a aquarium bred variant of what we hobbyists call , scientists however put this species in synonymy of C. aeneus.
This cory that we name C. schultzei is certainly a different species than C. aeneus but there is no type material of C. schultzei to prove that it is really this one.

Cheers,

Thanks for the info kamas!