# 鯨河馬亞目[编辑]

| 鲸河马形亚目 化石时期：始新世早期-现代 |
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| 科学分类  |
| 界： | 动物界 Animalia |
| 门： | 脊索动物门 Chordata |
| 纲： | 哺乳纲 Mammalia |
| 目： | 偶蹄目 Artiodactyla |
| 演化支： | 全撰类 Artiofabula |
| 演化支： | 鯨反芻類 Cetruminantia |
| 演化支： | 鯨凹齒形類 Cetancodontamorpha |
| 亚目： | **鲸河马形亚目 Whippomorpha** Waddell et al. 1999 |
| 演化支
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| * †双锥齿兽总科 Dichobunoidea
	+ †双锥齿兽科 Dichobunidae
	+ †沼猪科 Helohyidae
	+ †长尾猪科 Cebochoeridae
	+ †混兽科 Mixtotheriidae
* 凹齿下目 Ancodonta
	+ 河马总科 Hippopotamoidea
		- †石炭兽科 Anthracotheriidae
		- 河马科 Hippopotamidae
* 鲸形态类 Cetaceomorpha
	+ †劳氏兽科 Raoellidae
	+ 鲸下目 Cetacea
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**鲸河马亚目**（学名：Whippomorpha）也作**河马形亚目**，是偶蹄目的一个演化支，其涵义因语境而异，在默认偶蹄目包含鲸豚类时，表述为鲸河马亚目，包含鲸下目（鲸豚类）和凹齿下目（河马）；在偶蹄目仅指代狭义的陆生偶蹄动物，鲸豚类独立在外（保留传统的鲸目）时，表述为河马形亚目，仅包括2种现生河马及其史前非鲸类近亲。

## 分类

进化分支图显示河马形亚目属于偶蹄目，由河马科和鲸下目组成。
该亚目被定义为冠群，包含了鲸豚类与河马的共同祖先及其所有后裔，属偶蹄目（包括猪和反刍动物）下一个次级演化支。尽管基因证据已强烈支持鲸是从偶蹄目演化而来，但与河马共祖直至何时还尚不清楚。因此，旧有的偶蹄目是一个并系群。

河马形亚目的学名whippomorpha，由英文单词 wh[ale] （鲸）+ hippo[potamus]（河马）和 morphe（转化自希腊文 μορφή，意为“形态”）合成。

### 种系发生学

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| 偶蹄目
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 胼足亚目 Tylopoda  |
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| 全撰类
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 猪形亚目 Suina  |
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| 鯨反芻類
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| 反刍亚目
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 有角下目 Pecora  |
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 鼷鹿下目 Tragulina  |
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| Ruminantia
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| 鯨河馬亞目
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 凹齿下目 Ancodonta  |
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| 鲸下目
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 须鲸小目 Mysticeti  |
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 齿鲸小目 Odontoceti  |
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| Cetacea
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| Whippomorpha
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| Cetruminantia
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| Artiofabula
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| Artiodactyla
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| **鯨河馬亞目** |

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| 凹齒下目
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†河豬科 Choeropotamidae  |
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| 河馬總科
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†小丘齒獸亞科 Microbunodontinae

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†暹羅獸屬 *Siamotherium* |
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†石炭獸亞科 Anthracotheriinae  |
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†溝頜獸屬 *Bothriogenys* |
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†利比亞龍獸屬 *Libycosaurus* |
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†河炭獸屬 *Merycopotamus* |
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河馬科 Hippopotamidae  |
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| Hippopotamoidea
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| Ancodonta
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鯨形态類 Cetaceamorpha  |
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| **Whippomorpha**/**Cetancodonta** |