The Pelagic butterfish, Schedophilus maculatus, is a medusafish of the genus Schedophilus found in all warm oceans. Its length is up to about 11.81 in (30 cm).
The Pelagic butterfish is one of the smallest and rarest members of the Centrolophidae family. It has a very blunt head and narrow but deep body colored yellowish mottled with dark grey. The single long dorsal fin extends from above the gills to just before the caudal peduncle.
Juveniles are known to live within jellyfish, but move to deeper water as they grow and mature.
Illustration by Dr Tony Ayling