Scorpionfish
Scorpaenopsis diabolus
Sighting evidence at American Tanker Wreck, Mariana Islands (Guam & Saipan)
Devil scorpionfish lie motionless along the entire length of the wreck's hull, their camouflage matching the encrusting coral and sponge so precisely that many divers pass within centimetres without noticing them. The wreck's broken surface texture and mixed lighting create ideal habitat for these ambush predators, and patient observers can find 8 to 12 individuals on a single careful circuit of the outer hull.
Evidence at this site
No confirmed records on file at this site
Scorpionfish is listed as a curated species here based on historical reports.