**Cetartiodactyla** Cetacea eta Artiodactyla ordenak batzerakoan sortzen den kladoa da. Talde honetakoak dira baleak, izurdeak, hipopotamoak, behiak, zerriak edo gameluak, besteak beste. Oraindik kontsentsua ez badago ere zetazeoek artiodaktiloetatik eboluzionatu zutela uste da. Uste denez zetazeoengandik gertuen hipopotamoak daude, Cetancodonta kladoa osatuz. Kladograma ezberdinak proposatu dira afinitate hauek erakusteko.

Taxonomia
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Denbora luzez zetazeoen arbasoak Mesonychia desagertutako ordenan kokatu dira. Talde hau ungulatu haragijaleak ziren eta artiodaktiloekin harremanetan zeuden.

Pakistanen aurkitutako fosil batzuk, *Pakicetus* eta *Ambulocetus* generoei egotziak, artiodaktiloetatik eboluzionatu zutela konfirmatu dute, eta Mesonychia klado-ahizpa gisa jarri dute. Analisi genetikoetan ere oinarritzen da taldekatze hau, baina hipopotamoekin eginiko ikerketek ez dute gai osoa argitu. Kladograma honetan taldekatze posible bat aurkezten da:

  



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| Cetartiodactyla | 

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| Cetancodonta | 

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Erreferentziak
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1. ↑  Huffman, B. Discover the Ungulates of the World - Order Cetartiodactyla

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| Autoritate kontrola | 
* **Wikimedia proiektuak**
* Wd Datuak: Q27850
* Commonscat Multimedia: Artiodactyla
* Wikispecies Espezieak: Cetartiodactyla

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* **Datu taxonomikoak**
* ADW: Cetartiodactyla
* BioLib: 20876
* EOL: 46559234
* Paleobiology Database: 71830
* WoRMS: 370511

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* Wd Datuak: Q27850
* Commonscat Multimedia: Artiodactyla
* Wikispecies Espezieak: Cetartiodactyla