Linnaeus' now obsolete Bellua (order VII) included only Hippopotamus and Equus. He placed most other artiodactyls in Pecora (order IV) and did not recognize the order Perissodactyla (Rhinoceros fell in Glires and tapirs were omitted completely).
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Full reference: C. Linnaeus. 1758. Systema Naturae per Regna Tria Naturae, Secundum Classes, Ordines, Genera, Species, cum Characteribus, Differentiis, Synonymis, Locis. Editio Decima 1:1-824
Parent taxon: Ungulata according to C. L. Bonaparte 1845
See also Godman 1830 and Linnaeus 1758
Sister taxa: Artiodactylamorpha, Panperissodactyla, Trichenae, Polydactyli, Procreodi, Monochenae, Hydrophorae, Kharmerungulatum, Tesserachenae, Ganungulatum, Capridae, Barypoda, Protungulata, Hyraces, Ruminantes, Amblypoda, Palaeocladosictis, Tipotheria, Haloboidea, Diplarthra, Antilopidae, Sivatheridae, Altungulata, Cetungulata, Barytheria, Mesodactyli
Subtaxa: none
Ecology: scansorial insectivore
Distribution: there are no occurrences of Bellua in the database