[2] The specific name honours the Austrian explorer, botanist and archaeologist Emanuel von Friedrichsthal (1809-1842), who sent many specimens to Vienna from Central America, including the type of this fish.

Similar behaviour has also been observed in some species of Lake Malawi cichlids, particularly from the genus Nimbochromis.

[4] Physically similar to other members of the genus, especially P. managuensis and P. motaguensis, P. freidrichsthalii holds the broken band which runs horizontally.

The dark spots which is found on P. loiselli ıs often so closely grouped that it appears to be a single solid band.

Unlike all other members ın the genus, P. loiselli's main color is a solid yellow colouration.