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Physeteroidea is a superfamily that includes three extant species of whales: the sperm whale, in the genus Physeter, and the pygmy sperm whale and dwarf sperm whale, ...
Articles relating to the Physeteroidea, a superfamily that includes three extant species of whales: the sperm whale, in the genus Physeter, and the pygmy sperm whale and dwarf sperm whale, in the genus Kogia. Additional fossil representatives of both families are known.
Physeter is a genus of toothed whales.There is only one living species in this genus: the sperm whale (Physeter macrocephalus). [2] Some extremely poorly known fossil species have also been assigned to the same genus including Physeter antiquus (5.3–2.6 mya) from the Pliocene of France, [3] and Physeter vetus (2.6 mya – 12 ka) from the Quaternary of the U.S. state of Georgia. [4]
Miophyseter is an extinct genus of sperm whale in the superfamily Physeteroidea.It includes only one species, M. chitaensis, that was described in 2022 from the lower Miocene (Burdigalian) of Toyohama Formation, Chita District, Aichi Prefecture, Japan.
The sperm whale or cachalot [a] (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator.It is the only living member of the genus Physeter and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia.
Zygophyseter was discovered in the Pietra Leccese Formation in Italy from a skull, teeth, and vertebrae; [2] Brygmophyseter was discovered in the Bessho Formation in Japan from a nearly-complete skeleton; [3] and Acrophyseter and Livyatan both originate from the Pisco Formation in Peru and are known by only a skull. [4]
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Two main hypotheses exist for use of the spermaceti organ: It assists in controlling buoyancy by manipulating the spermaceti oil's temperature and, consequentially, its density, facilitating deep diving by cooling and surfacing by warming, as well as allowing the animal to remain motionless at great depth.