Species 9341

Species 9341 is the Borg designation for a space-dwelling species unsuitable for assimilation. 

History
Not much is known of their background. They were encountered by the Borg during their invasion of the Alpha Quadrant around 2377, when they were attempting to transfer the Omega particle to the Delta Quadrant before their final assault on Earth.

Biology
Species 9341 have two distinct shapes: entities and mothers. Entities are smaller amoeboid vessels armed with a single forward-firing beam that does not damage shields, but kills a significant number of crew members with a single strike, with Borg stations being particularly vulnerable. Mothers are larger and stronger, with the capability of creating new entities at a steady rate.