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The "spiders" of Rubi-Ka are very similar in body type to their smaller 8-legged cousins, but are many orders of magnitude larger and have four fewer legs, a fact reflected in the genera names, which all begin with the tetra- prefix. Also, with their increase in size has come a requisite change in the visual and mandibular structures of the animal's head, with these "spiders" developing mammalian eyes with color vision and a stronger, more reptilian jaw structure. When combined with their retention of a spider's ability to use toxin in hunting its prey (thus causing chemical damage to humans confronting them) and their tendency to operate in small groups, it is easy to see why the "spiders" on Rubi-Ka are one of the more feared groups of animals among the newer settlers.

There are five individual genera of "spider" on Rubi-Ka, which, though similar in overall appearance, do have significant differences in size, temperament, speed, and reproductive capacity. Bloodcreepers include the standard Bloodcreeper, and Boneheaded and Speckled types. Nightcrawlers include standard, Old, and Ancient types. Spinners are only known to include the Fearspinner (shown). Gargantulas include the standard, Old, and Ancient types. Widows are only known to include the Red Widow.

The purpose of spiders in Omni-Tek terraforming regions is mainly as crowd control: similar to their ancient Earth ancestors, the spiders of Omni-Tek planets are used as a check on potential population explosions of other terraformers, like Stalkers, Scorpiods, and Offals.