Animal Species:Hammerjaw, Omosudis lowii Günther, 1887

The Hammerjaw has an iridescent silvery-bronze colour. It is a predator of fishes and squid.

Hammerjaw trawled during the NORFANZ expedition

Mark McGrouther © NORFANZ Founding Partners

Standard Common Name

Hammerjaw

Alternative Name/s

Omosudid

Identification

The Hammerjaw has a strongly compressed body that lacks scales. It has a very large mouth with a truncate lower jaw. There is at least one huge fang on the lower jaw and one to four fangs on the palatines. A short based dorsal fin is positioned behind the middle of the body. A dorsal adipose fin is positioned above the posterior anal fin rays. There is a dermal keel present on the caudal peduncle. The species has an iridescent silvery-bronze colour.

Size range

The species grows to 30 cm in length.

Distribution

In Australia it is known from scattered localities off New South Wales, and off south-eastern and north-western Western Australia.

The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums.  Source: Atlas of Living Australia.

Omosudis lowii

Distribution by collection data

Ozcam map of Hammerjaw specimens in the Australian Museums.

What does this mean?

Habitat

It occurs in mesopelagic and bathypelagic depths in temperate and tropical marine waters worldwide.

Feeding and Diet

The Hammerjaw is a predator of fishes and squid.

Classification

Species:
lowii
Genus:
Omosudis
Family:
Omosudidae
Order:
Aulopiformes
Class:
Actinopterygii
Subphylum:
Vertebrata
Phylum:
Chordata
Kingdom:
Animalia

What does this mean?

References

  1. Gomon, M.F. in Gomon, M.F., Glover, C.J.M. & R.H. Kuiter (Eds). 1994. The Fishes of Australia's South Coast. State Print, Adelaide. Pp. 992.
  2. Hoese, D.F., Bray, D.J., Paxton, J.R. & G.R. Allen. 2006. Fishes. In Beesley, P.L. & A. Wells. (eds) Zoological Catalogue of Australia. Volume 35. ABRS & CSIRO Publishing: Australia. parts 1-3, pages 1-2178.
  3. Paxton, J.R. & V.H. Niem 1999. Omosudidae. In Carpenter, K.E. & V.H. Niem (Eds). FAO Species Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. Volume 3. Batoid fishes, chimaeras and bony fishes part 1 (Elopidae to Linophrynidae). FAO, Rome. Pp. iii-vi, 1398-2068.

 


Mark McGrouther , Collection Manager, Ichthyology
Last Updated:

Tags Fishes, Ichthyology, Hammerjaw, Omosudidae, NORFANZ, Omosudis lowii, Omosudid, silvery-bronze, iridescent, compressed body, large mouth, fang, 10 cm - 30 cm, mesopelagic water, bathypelagic water, tropical water, temperate water, marine,