Umbracygot

Once known as somalcygots—named after the Azlanti designation of Lost Golarion's only moon, Somal—these enormous, territorial flatworms claim mile‑wide areas of a moon, asteroid, or similar patches of airless environments. Now referred to as umbracygots, these beasts enter vicious frenzies when other species stumble into their domains, looking to consume the interlopers. While relentless in their attempts to feed, umbracygots rarely pursue intruders beyond the borders of their territories to better conserve energy in an environment with limited nutrition.
When not feeding, an umbracygot enters a trancelike hibernation during which it constantly burrows in circles and strange patterns beneath the surface with endless, unthinking repetition. Some xenobiologists speculate that the patterns an umbracygot creates within the territory it inhabits indicate the creature’s mood or even their psychic impressions on the cosmos. Unfortunately, not enough data has been collected on these designs because an umbracygot awakens from its trance to attack when it senses a trespasser.
A typical adult umbracygot is 16 feet long and weighs 1,500 pounds. These creatures possess more intelligence than their monstrous appearances would suggest, but conversations with them are rare. Umbracygots usually socialize on the rare occasions when they’re full and don’t wish to exert energy on a wasteful meal, or when they’re mating. The knowledge gleaned from these unique interactions has proven useful in understanding their psychology, though their main concerns are defending their territory and consuming.