This version of Crustaceous Rex is the genetically-modified aquatic kaiju in the fanfiction series, Godzilla: Clash of the Monsters.
This version of Crustaceous Rex resembles a Skullcrawler with bulbous eyes and squid-like tentacles on its mouth and chest for constricting and immobilizing opponents. Its body is covered in an iridescent, olive green exoskeleton and has a large fish-like dorsal fin on its back. It has dark yellow skin and long, massive forelimbs and no hindlimbs, as well as long, lobster-like tail.
- It is the aquatic equivalent of Skullcrawler.