Ginkgo-toothed Beaked Whale - Mesoplodon ginkgodens

Taxonomy & Nomenclature

Scientific Name Mesoplodon ginkgodens
Author Nishiwaki and Kamiya, 1958
Taxonomic Rank Species
Taxonomic # 180510
Common Names English: ginkgo-toothed whale
English: Ginkgo-toothed Beaked Whale
Spanish: Ballena-picuda japonesa
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

Adult male ginkgo-toothed beaked whales are dark gray, with light spots; females are apparently lighter. Unlike most other beaked whales, they generally do not appear to be scarred. The throat grooves, dorsal fin, and tail flukes are typical for Mesoplodon species.

Bulls have flattened tusks that barely break the gumline, slightly behind the middle of the lower jaw; erupted teeth are absent in females. Maximum known sizes are 4.9 m (females) and 4.8 m (males). At birth, they are thought to be about 2-2.5 m.

Can be Confused With

The uniform dark pigmentation, small posteriorly-placed teeth, and lack of characteristic ziphiid scars may allow a tentative classification of adult male ginkgo-toothed beaked whales. Otherwise, this species will be virtually indistinguishable from other mesoplodonts.

Distribution

This species is known from widely scattered sightings, strandings, and collections (albeit sparse) in temperate and tropical waters of the Indo-Pacific Ocean.

Ecology and Behavior

Almost nothing is known of the biology of the ginkgo-toothed beaked whale.

Feeding and Prey

Ginkgo-toothed beaked whales are presumed to be primarily squid eaters.

Threats and Status

This species has occasionally been taken by Japanese whalers. Currently, ginkgo-toothed 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.

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 TSN180510
Status - ESA, U.S. FWS -
    -
Status - Red List, IUCN -
    DD (Global or one of the sub regions)
#records (spatial)1
#records (non-spatial)0
#datasets1
Year1983
Latitude-38.38 - -38.38
Longitude142.15 - 142.15
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