Squatina squatina the angelshark or monkfish is a species of shark in the family squatinidae known generally also as angel sharks that were once widespread in the coastal waters of the northeastern atlantic oceanwell adapted for camouflaging itself on the sea floor the angelshark has a flattened form with enlarged pectoral and pelvic fins giving it a superficial resemblance to a ray. Mantle length ml is the standard size measure for coleoid cephalopods shell diameter being more common for nautiluses and is almost universally reported in the scientific literaturethe mantle is the cephalopods body lying posterior to the head and enclosing the visceral mass and mantle cavity the latter being used for locomotion by jet propulsion.