There are 5 species in the genus Parachromis. P.managuensis and P.dovii being two of them.
P.friedrichsthalii, P.loisellei and P.motaguensis are the other three species. The last three species average aroung a foot in length. P.managuensis and P.dovii can get much larger. I have had P.managuensis, dovii and loiselli. None of these fish were very mean. In my experiance, they all had temperaments like Oscars.