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The false killer whale (Pseudorca crassidens) is a species of oceanic dolphin that is the only extant representative of the genus Pseudorca. It is found in oceans worldwide but mainly in tropical regions. It was first described in 1846 as a species of porpoise based on a skull, which was revised when the first carcasses were observed in 1861.
In effect, "tetrapod" is a name reserved solely for animals which lie among living tetrapods, so-called crown tetrapods. This is a node-based clade , a group with a common ancestry descended from a single "node" (the node being the nearest common ancestor of living species).
Parvorder Mysticeti (Baleen whales) Family Balaenidae (right and bowhead whales) Family Cetotheriidae (pygmy right whale) Family Eschrichtiidae (gray whale) Family Balaenopteridae (rorquals) Parvorder Odontoceti (Toothed whales) Family Physeteridae (sperm whale) Family Kogiidae (pygmy and dwarf sperm whales) Family Ziphiidae (beaked whales)
Tetrapodomorpha (also known as Choanata [3]) is a clade of vertebrates consisting of tetrapods (four-limbed vertebrates) and their closest sarcopterygian relatives that are more closely related to living tetrapods than to living lungfish.
The site was remote and dangerous, researchers say.
Stegocephali was re-established to replace the broad definition of Tetrapoda, resolving the usage of two conflicting definitions in discussions of tetrapod evolution. Stegocephali was coined in 1868 by the American paleontologist Edward Drinker Cope , who used it as a general category of prehistoric amphibians.
Spade-toothed whales are the world’s rarest, with no live sightings ever recorded. No one knows how many there are, what they eat, or even where they live in the vast expanse of the southern ...
A humpback whale has stunned scientists with a journey that spanned three oceans and more than 8,000 miles, setting the record for the longest known migration between breeding grounds.