Knowra Cetartiodactyla Cetartiodactyla Cetartiodactyla is the mammalian clade containing even-toed ungulates and cetaceans, united by descent from a common ancestor. It includes whales, dolphins, pigs, camels, deer, and their relatives.
Artiodactyla : A traditional mammalian order of even-toed ungulates, including pigs, camels, deer, cattle, and hippopotamuses. Cetartiodactyla combines this traditional grouping with cetaceans.
Whale evolution : The evolutionary history through which land-dwelling mammals gave rise to modern whales. Whale evolution supplies the striking transition that joins cetaceans to their terrestrial relatives.
Carl Linnaeus : A Swedish naturalist who established the foundations of modern biological nomenclature and classification. His classification predates the evolutionary evidence that united whales and even-toed ungulates.
Paraxonia : A traditional grouping of mammals whose limb axes pass between the third and fourth digits, including even-toed ungulates. Unlike Cetartiodactyla, this traditional grouping excludes whales.
Cetacea : The mammalian group comprising whales, dolphins, and porpoises. Cetaceans are nested within the broader cetartiodactyl clade.
Hippopotamidae : The mammalian family containing living hippopotamuses and their extinct relatives. Molecular evidence places hippopotamuses as the closest living relatives of cetaceans.
The Origin of Species : Charles Darwin’s 1859 book presenting evidence for evolution by natural selection and common descent. Common descent supplied the framework for interpreting the unexpected whale–ungulate relationship.
Ungulata : A historical grouping of hoofed mammals whose membership and evolutionary status vary among classifications. Its scope has shifted, while Cetartiodactyla names a specific ancestry-based clade.
Cladistics : A method of classifying organisms by shared ancestry and branching evolutionary relationships. The clade’s definition depends on common ancestry rather than a shared body plan.
Pakicetus : An early Eocene whale known from fossils, with a terrestrial body and diagnostic features of cetacean ancestry. Its anatomy records an early stage in the transition toward aquatic cetaceans.
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