Bighead searsid explained

The bighead searsid (Holtbyrnia anomala) is a species of tubeshoulder fish.^{[1] [2]}

Description

It maximum length is .^[3] 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.^[4]

It is dark red in colour.^[5] Its photophores are rudimentary (except for the shoulder organ), hence its specific name anomala ("unusual").^{[6] [7] [8]}

Habitat

The bighead searsid lives in the North Atlantic Ocean; it is a mesopelagic fish, living at depths of .^{[9] [10]}

Notes and References

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