Crested Bigscale, Poromitra crassiceps
The Crested Bigscale, Poromitra crassiceps, whose Spanish common name is aletudo crestada, is a species in the family Melamphaidae, the Bigscales and Ridgeheads, known as aletudosin in Mexico. Globally, there are thirty-seven species in the family placed in five genera. There are twenty-two global member members of the Poromitra genus, of which three are found in Mexican waters, all in the Pacific.
The Crested Bigscales have elongated rectangular bodies with a serrated crest on top of their head. They are black with dark fins. They have three dorsal spines with 11 to 14 soft rays and one anal spine with 8 to 11 soft rays. Their caudal fin is shallow and forked and their pectoral fins are long, slender, and longer than the head.
The Crested Bigscales are a mesopelagic and bathypelagic species found at depths between 450 and 13,120 feet. Juveniles are found in shallower water than adults. They reach a maximum length of 19.0 cm (7.5 inches). They migrate vertically toward the surface for feeding during the night. They are oviparous producing planktonic eggs and larvae and have a lifespan of 9 years. Adults feed on small crustaceans. They are found in all Mexican waters of the Pacific.
The Crested Bigscales are too rare and too small to be of interest to most.