Gray's Beaked Whale - Mesoplodon grayi

Taxonomy & Nomenclature

Scientific Name Mesoplodon grayi
Author von Haast, 1876
Taxonomic Rank Species
Taxonomic # 180511
Common Names English: Gray's Beaked Whale
English: Haast's beaked whale
Current Standing valid
Taxonomic Parents Kingdom: Animalia
  Phylum: Chordata
    Subphylum: Vertebrata
      Class: Mammalia
        Subclass: Theria
          Infraclass: Eutheria
            Order: Cetacea
              Suborder: Odontoceti
                Family: Hyperoodontidae
                  Genus: Mesoplodon
Taxonomic Children
Synonyms (since 1950)
Taxonomic data is courtesy of the Integrated Taxonomic Information System (ITIS)
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Physical Description / Field Identification

Gray’s beaked whales have small heads, with extremely long, narrow beaks. Although mostly gray, white patches are found in the genital region and the beak becomes white in adults (Gray’s beaked whales observed in the eastern tropical Pacific have had white lower jaws and dark upper jaws, separated by a straight mouthline).

There are two small, triangular teeth set in the middle of the lower jaw, which erupt only in bulls, and 17-22 pairs of small teeth in the upper jaw. Maximum known sizes are 5.6 m for both sexes. These animals are known to reach weights of at least 1100 kg. Length at birth is probably between 2 and 2.5 m.

Can be Confused With

The long white beak (often stuck up out of the water as the animal surfaces) and straight mouthline may allow Gray’s beaked whales to be distinguished from other other mesoplodonts, if a good look is obtained.

Distribution

This is primarily a Southern Hemisphere cool temperate species, which is possibly Circum-Antarctic in occurrence. There are many records from New Zealand and Australia, and others from South Africa, Argentina, Chile, and Peru. This species may wander into the Northern Hemisphere on occasion, if a stranding record in the Netherlands is accurate.

Ecology and Behavior

Very little is known of the biology of this species. Gray’s beaked whales are seen mostly as singles or pairs; however, there is one record of a mass stranding of 28 of these whales. Gray’s beaked whales generally raise their long snouts out of the water when surfacing.

Feeding and Prey

Like other mesoplodonts, they are thought to feed mainly on cephalopods in deep waters.

Threats and Status

This species may not be as rare as some other species of the genus. No significant exploitation is known. Currently, Gray’s beaked whales are ‘Data Deficient’ (IUCN) and ‘Not Listed’ (ESA).

 

Links

References

Dalebout, M.L. 2002. Species identity, genetic diversity, and molecular systematic relationships among the Ziphiidae (beaked whales). Ph.D. dissertation, University of Auckland, New Zealand.

Gales, N.J., M.L. Dalebout and J.L. Bannister. 2002. Genetic identification and biological observation of two free-swimming beaked whales Hector’s beaked whale (Mesoplodon hectori, Gray 1871), and Gray’s beaked whale (Mesoplodon grayi, von Haast, 1876). Marine Mammal Science 18:544-551.

Mead, J.G. 1989. Beaked whales of the genus Mesoplodon. pp. 349-430 in S.H. Ridgway and R. Harrison, eds. Handbook of marine mammals, Vol. 4: River dolphins and the larger toothed whales. Academic Press.

Pitman, R.L. 2002. Mesoplodont whales Mesoplodon spp. pp. 738-742 in W.F. Perrin, B. Würsig and J.G.M. Thewissen, eds. Encyclopedia of marine mammals. Academic Press.

ITIS TSN180511
Status - ESA, U.S. FWS -
    -
Status - Red List, IUCN -
    DD (Global or one of the sub regions)
#records (spatial)29
#records (non-spatial)0
#datasets6
Year1974 - 2006
Latitude-61.00 - -30.33
Longitude-67.62 - 153.12
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