Tylosurus acus

Tylosurus acus (keel-jawed needlefish) is a game fish of the family Belonidae.

Tylosurus acus
FMIB 51392 Hound-Fish Tylosurus acus.jpeg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Beloniformes
Family: Belonidae
Genus: Tylosurus
T. acus
Binomial name
Tylosurus acus
(Lacépède, 1803)
  • T. acus acus (Lacepede, 1803)
  • T. a. imperialis (Rafinesque, 1810)
  • T. a. melanotus (Bleeker, 1850)
  • T. a. rafale Collette and Parin, 1970


The keel-jawed needlefish is widespread in the Atlantic and Indo-Pacific oceans.[2]


There are four recognised subspecies of Tylosurus acus:[1]

Tylosurus pacificus was once considered a subspecies of T. acus but is now considered a distinct species.[3] Although acus was suppressed by ICZN Opinion 900, continued usage of the name led to Tylosurus acus being reinstated as a valid name.[4][5] Some authorities raise the four subspecies to species level.[6]


  1. ^ a b Collette, B.B.; Aiken, K.A. & Polanco Fernandez, A. (2015). "Tylosurus acus". IUCN Red List of Threatened Species. 2015: e.T189820A15537844. doi:10.2305/IUCN.UK.2015-4.RLTS.T189820A15537844.en.
  2. ^ "Species Tylosurus acus Lacepède 1803". FishWisePro. 1803. Retrieved 19 April 2020.
  3. ^ Collette, B. B. and H. M. Banford 2001. Status of the eastern Pacific agujon needlefish Tylosurus pacificus (Steindachner, 1876) (Beloniformes: Belonidae). Revista de Biología Tropical v. 49 (Suppl. 1): 51-57.
  4. ^ Collette, B. B. 1970. Three specific names in the family Belonidae (Pisces): suppressed under the plenary powers. Bulletin of Zoological Nomenclature v. 26 (no. 5-6): 213-216.
  5. ^ OPINION 2169 (Case 3297) Sphyraena acus Lacépède, 1803 (currently Tylosurus acus; Teleostei, BELONIDAE): reinstated as a valid name. Bulletin of Zoological Nomenclature 2007 64:75-76.
  6. ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Tylosurus". Catalog of Fishes. California Academy of Sciences. Retrieved 2 August 2019.

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