| Ginkgo-toothed beaked whale | |
|---|---|
| Size comparison against an average human | |
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Cetacea |
| Family: | Ziphiidae |
| Genus: | Mesoplodon |
| Species: | Mesoplodon ginkgodens |
| Binomial name | |
| Mesoplodon ginkgodens Nishiwaki and Kamiya, 1958 |
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| Ginkgo-toothed Beaked Whale range | |
The ginkgo-toothed beaked whale (Mesoplodon ginkgodens) is a poorly known species of whale even for a beaked whale, and was named for the unusual shape of its dual teeth. It is a fairly typical-looking species, but is notable for the males not having any scarring.
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Ginkgo-toothed beaked whales are more robust than most mesoplodonts, but otherwise look fairly typical. Halfway through the jaw, there is a sharp curve up where the ginko leaf-shaped tooth is. Unlike other species such as Blainville's beaked whale and Andrews' beaked whale, the teeth do not arch over the rostrum. The beak itself is of a moderate length. The coloration is overall dark gray on males with light patches on the front half of the beak and around the head, and small white spots on the bottom of the tail, but the location may be variable. Females are a lighter gray and have countershading. Both genders reach 4.9 meters (16 feet) in length. They are around 2.4 meters long (8 feet) when born. The largest sizes for male and female are 4.8 meters and 4.9 meters, respectively. The size of these whales at birth are about two meters.
This beaked whale has had less than 20 strandings off the coasts of Japan, California, the Galapagos Islands, New South Wales, New Zealand, Sri Lanka, the Maldives, and the Strait of Malacca. Its range is essentially tropical and temperate waters in the Indian and Pacific Ocean. There is no way to estimate the population.
The males probably do not engage in combat, and the species probably feeds on squid and fish. No other information is known.
The only observations of this species while alive have come from hunters off the coasts of Japan and Taiwan, who occasionally take an individual. They are also affected by drift gillnets.