Most of the main races in the first games (mudokons, Glukkons, sligs) have reproducing queens that we haven't seen, and the sterile workers approximate male characters. Though the Clakkerz and Grubbs have equal male/female populations, and the outlaw Jo'momma is assumed to be female.
It is not clear for other species, whether their jobs are just one, or else we can't tel the difference. It is assumed, for instance, that most of the scrabs in MO are female, based upon cryptic and contradicting information provided, unsurprisingly, by Alf.
__________________
| (• ◡•)| (❍ᴥ❍ʋ)
|