Misidentified Pet Hisser Roaches?

[Jerah Teoh Yong Qiang]

Hi guys,

So I like to know if anyone here keeps different species of hissers? Currently I've got 6 Portentosas in a 10 gallon and I've just ordered another 3 Black morphs. Pictures of those I ordered below (from the seller's post):



However, I do have some concerns; roaches being a rather... niche pet here in Malaysia, I'm a bit worried these Black specimens have been misidentified as something they're not. I've noticed they look similar to Gromphardorhina Grandidieri instead. But then again, I've read somewhere that all supposed Grandidieri's in captivity are not true Grandidieri but color variations of Portentosa and P. Vanwaerebecki.

Also, should I house the Blacks separately then, even if they're true Portentosa?

Can someone help clear this up please? Would appreciate it lots!