Cyclothone

Cyclothone is a genus containing 13 extant species of bioluminescent fish, commonly known as 'bristlemouths' or 'bristlefishes' due to their shared characteristic of sharp, bristle-like teeth. These fishes typically grow to around , though some can be larger. These deep-sea fish are most commonly found in the mesopelagic zone of the ocean, mostly at depths of over 300 meters (1,000 feet), and many species have bioluminescence. Cyclothone is believed to be the most abundant fish genus on Earth, with estimates that there are up to a quadrillion individuals ( , or one million billion in the short scale) within the current global population. They are so abundant that they are also believed to be the most abundant genus of vertebrate on earth.

Cyclothone is a genus containing 13 extant species of bioluminescent fish, commonly known as 'bristlemouths' or 'bristlefishes' due to their shared characteristic of sharp, bristle-like teeth. These fishes typically grow to around , though some can be larger. These deep-sea fish are most commonly found in the mesopelagic zone of the ocean, mostly at depths of over 300 meters (1,000 feet), and many species have bioluminescence. Cyclothone is believed to be the most abundant fish genus on Earth, with estimates that there are up to a quadrillion individuals ( , or one million billion in the short scale) within the current global population. They are so abundant that they are also believed to be the most abundant genus of vertebrate on earth. ==Species== Cyclothone acclinidens. There are currently 14 recognized extant species in this genus: Cyclothone acclinidens Garman, 1899 (Benttooth bristlemouth) Cyclothone alba A. B. Brauer, 1906 (Bristlemouth) Cyclothone atraria C. H. Gilbert, 1905 (Deep-water bristlemouth) Cyclothone braueri Jespersen & Tåning, 1926 (Garrick) Cyclothone kobayashii Miya, 1994 (Kobayashi's bristlemouth) Cyclothone livida A. B. Brauer, 1902 Cyclothone microdon (Günther, 1878) (Veiled anglemouth) Cyclothone obscura A. B. Brauer, 1902 (Hidden bristlemouth) Cyclothone pallida A. B. Brauer, 1902 (Tan bristlemouth) Cyclothone parapallida Badcock, 1982 (Shadow bristlemouth) Cyclothone pseudoacclinidens Quéro, 1974 Cyclothone pseudopallida Mukhacheva, 1964 (Slender bristlemouth) Cyclothone pygmaea Jespersen & Tåning, 1926 Cyclothone signata Garman, 1899 (Showy bristlemouth) ===Extinct species=== There are currently 4 nominal extinct species and several unnamed extinct species in this genus: Cyclothone solitudinis Jordan, 1907 – from the Late Miocene of California, United States. Cyclothone mukhachevae Nazarkin, 2015 – from the Middle to Late Miocene of Russia. Cyclothone gaudanti Přikryl & Carnevale, 2017 – from the Late Miocene of Crete, Greece. Cyclothone duhoensis Nam & Nazarkin, 2021 – from the Middle Miocene of South Korea; the oldest nominal species in the genus. The oldest species yet to be named in the genus is discovered from the Middle Miocene deposits of Honshu Island, Japan. Other unnamed species are also known from Pliocene and Pleistocene deposits of Italy. Microfossils of indeterminate species in marine sediments sampled from the Southern Ocean extend records of the genus back to the earliest Eocene, around 55.6 million years ago. ==References==

Text derived from https://en.wikipedia.org/w/index.php?oldid=1369791009 under CC BY-SA 4.0; modifications have been made.