''Coelorinchus longissimus'' is a species of

rattail Grenadiers or rattails are generally large, brown to black gadiform marine fish of the subfamily Macrourinae, the largest subfamily of the family Macrouridae. Found at great depths from the Arctic to Antarctic, members of this subfamily are am ...

; this deep-water fish is found in the waters around Taiwan and southern

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. This elongated fish grows to a length of about 36 cm. It has a large head with oval eyes and a small inferior mouth with conical teeth. It has a long

bioluminescent Bioluminescence is the production and emission of light by living organisms. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some Fungus, fungi, microorganisms including ...

organ in front of the

anus The anus (Latin, 'ring' or 'circle') is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, d ...

References

A new species, ''Caelorinchus sheni'', and 19 new records of grenadiers (Pisces: Gadiformes: Macrouridae) from Taiwan - CHIOU Mei-Luen ; SHAO Kwang-Tsao ; IWAMOTO Tomio
Macrouridae Fish described in 1943 Taxa named by Kiyomatsu Matsubara {{Gadiformes-stub