Phaeoptyx
Phaeoptyx is a genus of marine fish belonging to the family Phaeoptychidae. The genus is monotypic, containing a single species, Phaeoptyx conklini, commonly known as the “conklin’s pearlfish” or the “conklin’s luminous pearlfish”.
Characteristics
Phaeoptyx conklini is a small, bioluminescent fish typically measuring around 3 to 4 cm in length. It possesses a slender, eel-like body and a distinctive head with a short, blunt snout. The fish is characterized by its lack of scales, its translucent skin, and its luminous organs, which are located on the ventral surface of its body. These organs produce a blue-green light, which is thought to play a role in attracting prey or deterring predators. The species has a single dorsal fin, a single anal fin, and a caudal fin that is reduced in size. They are characterized by their lack of teeth and the absence of a swim bladder.
Environments
Phaeoptyx conklini is found in the deep waters of the Atlantic Ocean, specifically off the coast of North America. This species typically inhabits depths between 1,000 and 1,800 meters, where it lives in association with deep-sea invertebrates, particularly crinoids. The fish has been observed to live as a commensal in the coelomic cavity of certain crinoids, feeding on the crinoid's food.
References
For further information on Phaeoptyx, please consult the following references: