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. The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. The females cooperate to protect and nurse their young.
Try out PMC Labs and tell us what you think. Learn More. The angiosperm female gametophyte is critical for plant reproduction. It contains the egg cell and central cell that become fertilized and give rise to the embryo and endosperm of the seed, respectively. Female gametophyte development begins early in ovule development with the formation of a diploid megaspore mother cell that undergoes meiosis. One resulting haploid megaspore then develops into the female gametophyte.
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The Water Dragon is Australia's largest dragon lizard and can be found living along healthy waterways in Sydney. The genus Physignathus was described by George Cuvier in based on the type specimen of the genus; the Green Water Dragon, Physignathus cocincinus of south-east Asia. The name Physignathus translates to "puff-cheek" and refers to the bulging appearance of the throat and lower jaw.