Codlets are a family, Bregmacerotidae, of cod

Cod

Cod is the common name for genus Gadus, belonging to the family Gadidae, and is also used in the common name for various other fishes. Cod is a popular food with a mild flavor, low fat content and a dense, flaky white flesh. Cod livers are processed to make cod liver oil, an important source of...

-like fishes, containing the single genus Bregmaceros.

They are found in tropical and subtropical waters throughout the world.

They are very small fishes: the big-eye unicorn-cod, Bregmaceros rarisquamosus, reaches no more than 1.5 cm, and even the largest, Bregmaceros lanceolatus, reaches only 11.5 cm.

Their scientific name is from Greek

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 bregma meaning the top of the head, and keras meaning "horn"; this refers to their occipital ray (a spine emerging from the top of the head).

Species

There are twelve species:

• Bregmaceros arabicus D'Ancona & Cavinato, 1965.
• Antenna codlet, Bregmaceros atlanticus
  Bregmaceros atlanticus
  Bregmaceros atlanticus is a species of fish in the Bregmacerotidae family.-References:*C. E. Dawson, Observations on the Anacanthine Fish Bregmaceros atlanticus in the North-Central Gulf of Mexico, Copeia, Vol. 1966, No. 3 , pp. 604-605....
  
  Goode
  George Brown Goode
  George Brown Goode , was an ichthyologist, although most of his time was spent as a museum administrator and he was very interested in the history of science, especially the history of the development of science in America. Goode graduated from Wesleyan University and studied at Harvard University...
  
   & Bean
  Tarleton Hoffman Bean
  Tarleton Hoffman Bean was an American ichthyologist, born at Bainbridge, Pennsylvania on 8 October 1846. He died in Albany, New York on 28 December 1916.-FAMILY AND EDUCATION :...
  
  , 1886.
• Codlet, Bregmaceros bathymaster Jordan
  David Starr Jordan
  David Starr Jordan, Ph.D., LL.D. was a leading eugenicist, ichthyologist, educator and peace activist. He was president of Indiana University and Stanford University.-Early life and education:...
  
   & Bollman, 1890.
• Striped codlet, Bregmaceros cantori Milliken & Houde, 1984.
• Stellate codlet, Bregmaceros houdei Saksena & Richards, 1986.
• Japanese codlet, Bregmaceros japonicus Tanaka, 1908.
• Bregmaceros lanceolatus Shen, 1960.
• Spotted codlet
  Spotted codlet
  The spotted codlet, Macclelland's unicorn-cod, or unicorn cod, Bregmaceros mcclellandi, is a small deepwater codlet fish found in the west Indian Ocean to eastern Thailand...
  
  , Macclelland's unicorn-cod, or Unicorn cod, Bregmaceros mcclellandi Thompson, 1840.
• Smallscale codlet, Bregmaceros nectabanus Whitley, 1941.
• Bregmaceros neonectabanus Masuda, Ozawa & Tabeta, 1986.
• Bregmaceros pescadorus Shen, 1960.
• Big-eye unicorn-cod, Bregmaceros rarisquamosus Munro, 1950.