Bighead searsid

The bighead searsid (Holtbyrnia anomala) is a species of tubeshoulder fish.[2][3]

Bighead searsid
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Alepocephaliformes
Family: Platytroctidae
Genus: Holtbyrnia
Species:
H. anomala
Binomial name
Holtbyrnia anomala
(Krefft, 1980)

Description

It maximum length is 25 cm (9.8 in).[4] Its head is large, making up over a third of the fish's length. It has 25–31 gillrakers; 5–11 pyloric caecae. The snout is pointed, with premaxillary tusks pointing forward.[5]

It is dark red in colour.[6] Its photophores are rudimentary (except for the shoulder organ), hence its specific name anomala ("unusual").[7][8][9]

Habitat

The bighead searsid lives in the North Atlantic Ocean; it is a mesopelagic fish, living at depths of 700–2,000 m (2,300–6,600 ft).[10][11]

References
  1. Academy), Tomio Iwamoto (Cal (July 15, 2014). "IUCN Red List of Threatened Species: Holtbyrnia anomala". IUCN Red List of Threatened Species.
  2. "ADW: Holtbyrnia anomala: CLASSIFICATION". animaldiversity.org.
  3. Oceanography, Scripps Institution of (July 1, 1927). Bulletin of the Scripps Institution of Oceanography of the University of California. University of California Press. ISBN 9780520095403 – via Google Books.
  4. "WoRMS - World Register of Marine Species - Holtbyrnia anomala Krefft, 1980". www.marinespecies.org.
  5. "Marine Species Identification Portal : Bighead searsid - Holtbyrnia anomala". species-identification.org.
  6. "Holtbyrnia anomala (Bighead searsid)". descna.com.
  7. "FIGURE 6 The shoulder organ ( ) of Holtbyrnia anomala excreting..." ResearchGate.
  8. Nations, Food and Agriculture Organization of the United (August 1, 2020). Identification guide to the mesopelagic fishes of the central and south east Atlantic Ocean. Food & Agriculture Org. ISBN 9789251330944 – via Google Books.
  9. Coad, Brian W.; Reist, James D. (January 1, 2018). Marine Fishes of Arctic Canada. University of Toronto Press. ISBN 9781442647107 – via Google Books.
  10. "Holtbyrnia anomala, Bighead searsid". www.fishbase.se.
  11. Carwardine, Mark (July 1, 1986). "Iceland, Nature's Meeting Place: A Wildlife Guide". Iceland Review – via Google Books.
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