A few years ago, was Princisia vanwaerebecki and Gromphadorhyna portentosa, and, of course, animals whith different genera can´t reproduce. Now, there are some Taxonomist that say they are in the same genera: Gromphadorhyna princisia and Gromphadorhyna portentosa.
I think the last one is right becouse the two sp. are very similar, so, the can hybrid.
Now, I´m looking for the differences between G. portentosa and G. princisia (P. vanwaerebecki). Taxonomy use the thorns in the legs to clasiffied the roaches.