Swarmers

Spiderlike creatures that are quite fast and usually numerous. They are of limited strength and very vulnerable to mortar and orbital towers. Laser towers will be ineffectual.

These appear very early on in the shipping campaign, and there are immature versions born from the wombs, which are shockingly tough and strong at attacking for their' size. When wombs succeed in birthing these miniature versions mortar and orbital towers are again an effective solution.