Blainville's Beaked Whale - Mesoplodon densirostris

Taxonomy & Nomenclature

Scientific Name Mesoplodon densirostris
Author (Blainville, 1817)
Taxonomic Rank Species
Taxonomic # 180517
Common Names English: dense-beaked whale
English: Blainville's Beaked Whale
English: densebeak whale
Spanish: Ballena-picuda de Blainsville
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)
See ITIS metadata in XML

Physical Description / Field Identification

Adult Blainville’s beaked whales are blue-gray above and white below; coloration of young has not been properly described. The dark areas tend to have round or oval white scars and scratches.

The lower jaw of this species is highly arched; a massive flattened tusk erupts from the top of this arch in adult males, and it extends above the top of the upper jaw. In some individuals the tusks are covered by a tassel of barnacles.

Maximum size for both sexes appears to be around 4.7 m. Length at birth is presumed to be between 2 and 2.5 m. Weights of up to 1033 kg have been recorded.

Can be Confused With

Generally, only adult males of this species will be distinguishable from other other mesoplodonts. The high arching mouthline and massive flattened tusks that extend above the upper jaw will allow identification of bulls.

Distribution

Blainville’s beaked whales occur in temperate and tropical waters of all oceans. Like other beaked whales, they are found mostly offshore in deep waters. This species has the most extensive distribution of any species of the genus.

Ecology and Behavior

Groups of 3-7 Blainville’s beaked whale have been recorded, although singles or pairs are most common. Dives of over 45 minutes have been recorded. There is a population of this species that is being well-studied in the Bahamas. Individual whales have been identified, based on natural marks.

Feeding and Prey

Squid are apparently the main food items, but some fish may be taken as well. Like other mesoplodonts, they are thought to be suction feeders.

Threats and Status

Some Blainville’s beaked whales have been taken incidentally by Japanese tuna boats off the Seychelles and western Australia, as well as directly by small cetacean hunters in various areas. Currently, this species is ‘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.

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 TSN180517
Status - ESA, U.S. FWS -
    -
Status - Red List, IUCN -
    DD (Global or one of the sub regions)
    DD (Global or one of the sub regions)
#records (spatial)78,881
#records (non-spatial)0
#datasets43
Year1817 - 2014
Latitude-54.48 - 52.24
Longitude-159.98 - 166.52
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