Dolichopteryx longipes

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Dolichopteryx longipes
Dolichopteryx longipes.jpg

Dolichopteryx longipes

Systematics
Overcohort : Clupeocephala
Cohort : Euteleosteomorpha
Order : Golden salmon (Argentiniformes)
Family : Ghostfish (Opisthoproctidae)
Genre : Dolichopteryx
Type : Dolichopteryx longipes
Scientific name
Dolichopteryx longipes
( Vaillant , 1888)

Dolichopteryx longipes is a deep-sea fish species from the ghost fishfamily(Opisthoproctidae). It occurs possibly circumpolar between 45 ° and 27 ° north latitude at sea depths of 500 to 2400 meters. The fish u. a. in the California Current and the South China Sea .

features

Dolichopteryx longipes becomes 18 cm long, has an elongated, pike-like, large-headed shape with a dorsal and anal fin that sit just in front of the caudal fin. Its pelvic fins are very long and sit far back. The dorsal fin is supported by ten to eleven, the anal fin by eight to nine rays. A line of dark chromatophores stretches along the almost anteriorly located sidelines . Dolichopteryx longipes has 46 to 47 vertebrae. Illuminating organs are missing.

The eye of Dolichopteryx longipes . On the right the normal eye with lens (blue) and retina (red), on the left the secondary eye with a mirror layer (green) that reflects the light coming from below onto a second retina

As with some other ghost fish, the eyes of Dolichopteryx longipes are also notable and show some particular adaptations. In addition to tubular eyes, which are provided with a lens and directed upwards, the fish has secondary eyes that pick up light coming from below, reflect it on a crystalline mirror layer of guanine and cast it onto a second retina.

Way of life

Dolichopteryx longipes is a mesopelagic species that usually lives below 450 meters. It feeds on small crustaceans, especially copepods . Eggs and larvae are planktonic .

swell

  • Wagner, HJ, Douglas, RH, Frank, TM, Roberts, NW and Partridge, JC (Jan. 27, 2009): A Novel Vertebrate Eye Using Both Refractive and Reflective Optics. Current Biology 19 (2): 108-114. doi : 10.1016 / j.cub.2008.11.061
  • Eschmeyer, Herald, Hamann: Pacific Coast Fishes , Peterson Field Guides, ISBN 0-395-33188-9

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