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Updated: Jun 19, 2026

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Published on: July 13, 2016
Hippopotamus and whale phylogeny
Jonathan H Geisler1, Jessica M Theodor
1Department of Geology and Geography and Georgia Southern Museum, Georgia Southern University, Statesboro, Georgia 30460-8149, USA. geislerj@georgiasouthern.edu
Whales (Cetacea) and hippopotamids share a common ancestor, with hippos being the closest living relatives. Raoellids are the closest extinct relatives, supporting shared aquatic adaptations.
Area of Science:
- Evolutionary biology
- Paleontology
- Molecular phylogenetics
Background:
- The evolutionary history of Cetacea (whales, dolphins, porpoises) is debated.
- Recent fossil discoveries suggested a link between Cetacea and Raoellidae, excluding Hippopotamidae.
Discussion:
- A reanalysis of phylogenetic data, including molecular characters, refutes the Cetacea-Raoellidae link.
- This reanalysis confirms Hippopotamidae as the closest extant family to Cetacea.
Key Insights:
- Hippopotamidae is the closest living family to Cetacea.
- Raoellids represent the closest extinct relatives to Cetacea.
- Aquatic adaptations in both groups likely stem from a common ancestor.
Outlook:
- Further research integrating fossil and molecular data will refine understanding of cetacean origins.
- This study reinforces the importance of molecular data in phylogenetic reconstructions.
- Comparative studies of aquatic adaptations in hippos and whales can illuminate evolutionary pathways.
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