The groups imported are heavily male. But even then, females are very tricky to identify. They will have some facial spotting and lines just like males, until they turn on their spawning colors when the face turns dark jade green and the spots disappear.
This is hard to explain but females can “turn off” their facial markings. Sometimes they look very faint and seem to blend into the background color, much the way discus and angels can “invert” their vertical barring so that its color goes light. Males cannot do this — they always have bold, dark spotting. I’ve also noticed in mine that males have very blue faces while females tend to have yellow/green faces like notatus.
RD, these are all formally described as Heros severus. They have red necks, 8.5 bars, and mottled green-yellow patterning that overlaps the vertical bars. Like other Heros species they’re spread through a fairly large distribution area (as opposed to a single river or lake like some species) and so there may be slight differences/geographical variants, but they’re all basically the same fish.