Nadir spider

Nadir spiders were large, carnivourous arthropods native to the comet Resh 3976; similar species could be found within other comets and asteroids.

Characteristics
Being silicon-based lifeforms like mynocks or exogorths, Nadir spiders were presumably capable of surviving in a vacuum, although they could survive in an atmosphere as well. The creature's bpdy consisted of a fat thorax covered in jagged plates, five spindly legs set at equidistant points, and a spiny head possessing five eyes and a single mouth with five beaks. The creatures were roughly the size of a man, and clever enough to ambush prospective prey from behind. In addition, Nadir spiders were capable of spewing a jet of corrosive acid, to a range of approximately 7.5 meters.