Anomalopidae

Anomalopidae is a family of marine fishes, commonly called flashlight fishes, with light-producing organs beneath their eyes. These organs contain luminous bacteria and can be exposed or covered by a movable shutter.

Bioluminescence: Bioluminescence is the production and emission of light by living organisms through chemical reactions. Flashlight fishes use bioluminescence to produce light beneath their eyes.
Counterillumination: Counterillumination is camouflage in which an animal emits light to match the brightness of its surroundings. Downward-facing light can reduce a fish’s silhouette when viewed from below.
Beryciformes: Beryciformes is a traditional order of mostly marine fishes that includes squirrelfishes and related groups. Flashlight fishes have historically been placed among beryciform fishes.
Photoblepharon: Photoblepharon is a genus of flashlight fishes with prominent light organs beneath the eyes. It is one of the family’s best-known genera.
Symbiosis: Symbiosis is a close, sustained association between organisms of different species. Their light organs house luminous bacteria in a close biological partnership.
Deep scattering layer: The deep scattering layer is a zone of marine organisms that migrates vertically through the water column each day. Flashlight fishes forage around layers where plankton and small animals concentrate.
Fish: Fish are aquatic vertebrates that typically breathe through gills and use fins for movement. Anomalopidae is a family within the diversity of fishes.
Anomalops: Anomalops is a genus of flashlight fishes in the family Anomalopidae. Its name is the source of the family name Anomalopidae.
Photobacterium: Photobacterium is a genus of marine bacteria that includes species capable of producing light. Species of this bacterial genus produce light in the organs of some flashlight fishes.
Zooplankton: Zooplankton are drifting aquatic animals and animal-like organisms that form a major part of marine food webs. Small planktonic animals are among the prey illuminated by flashlight fishes.

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BarreleyeCompared with: Its eyes are paired with active light organs rather than a transparent cranial dome.