The mid body spot above the lateral line is really not the determiner, but only if that spot is/becomes a dark area in the dorsal.
Many young cichlids of Heroine ancestry have some semblance of the spot.
Below a young festae.
notice a similar spot in beani.
I don't know if this is a proper observation, but in females the spot seems to migrate into the dorsal as they age, in males it simply dissipates.
In mature female festae it is fairly obvious.
2 females below, with a male in the same tank
but if a male is not present, the sexual determiner may be obscured.
a female below, no male in the tank