Independently from different host characteristics, do you feel like the aliens need different castes? Aside from queen and warrior ? If yes, which do you feel would make sense ?
I think, even you go with the space insect angle, different castes would only make sense in the biggest hives, where specialized organisms may be of use.
A lot of ant species work well with just queens and workers and the same with wasps, which were used to create the protomorph in Covenant.