Light pegs

Light pegs
Searsia koefoedi
Systematics
Subclass : Neuflosser (Neopterygii) Subclass : Real bony fish (Teleostei) Overcohort : Clupeocephala Cohort : Otomorpha Order : Alepocephaliformes Family : Light pegs
Scientific name
Platytroctidae
Roule , 1919

The light herrings (Platytroctidae; Syn . : Searsiidae) are a family of the Alepocephaliformes . The fish, which grow to be 9 to 30 centimeters long, live in the deep sea , mostly at depths between 300 and 1000 meters in the Atlantic , Indian and Pacific Oceans . They are missing in the Mediterranean .

features

The fish do not have a swim bladder . A black pigmented blister under the shoulder girdle, the shoulder bag, produces a glowing slimy fluid that can be expelled for defense through a ventral channel at the start of the sideline . Many species have luminous organs that are horizontal in juvenile fish and downward in adult fish. Platytroctes apus have no pelvic fins.

Pectoral 14–28, ventral 6–10, 4–8 gill rays, 40 to 52 vertebrae .

Genera and species

There are 13 genera, which together contain 39 species.

• Barbantus (Parr, 1951)
  • Barbantus curvifrons
  • Barbantus elongatus
• Holtbyrnia (Parr, 1937)
  • Holtbyrnia anomala
  • Holtbyrnia cyanocephala
  • Holtbyrnia innesi
  • Holtbyrnia intermedia
  • Holtbyrnia laticauda
  • Holtbyrnia latifrons
  • Holtbyrnia macrops
  • Holtbyrnia melanocephala
  • Holtbyrnia ophiocephala
• Matsuichthys (Sazonov, 1992)
  • Matsuichthys aequipinnis
• Maulisia (Parr, 1960)
  • Maulisia acuticeps
  • Maulisia argipalla
  • Maulisia isaacsi
  • Maulisia mauli
  • Maulisia microlepis
• Mentodus (Parr, 1951)
  

  Mentodus rostratus
  • Mentodus bythios
  • Mentodus crassus
  • Mentodus eubranchus
  • Mentodus facilis
  • Mentodus longirostris
  • Mentodus mesalirus
  • Mentodus perforatus
  • Mentodus rostratus
• Mirorictus (Parr, 1947)
  • Mirorictus taningi
• Normichthys (Parr, 1951)
  • Normichthys herringi
  • Normichthys operosus
  • Normichthys yahganorum
• Pectinantus (Sazonov, 1986)
  • Pectinantus parini
• Persparsia (Parr, 1951)
  • Persparsia kopua
• Platytroctes (Günther, 1878)
  

  Platytroctes apus
  • Platytroctes apus
  • Platytroctes mirus
• Sagamichthys (Parr, 1953)
  • Sagamichthys abei
  • Sagamichthys gracilis
  • Sagamichthys schnakenbecki
• Searsia (Parr, 1937)
  • Searsia koefoedi
• Searsioides (Sazonov, 1977)
  • Searsioides calvala
  • Searsioides multispinus

literature

• Joseph S. Nelson, Fishes of the World , John Wiley & Sons, 2006, ISBN 0-471-25031-7

Web links

Commons : Light herrings (Platytroctidae)  - Collection of images, videos, and audio files

• Light pegs on Fishbase.org (English)