Hyrachyus, Chasmotherium, and the early evolution of helaletid tapiroids

L. B. Radinsky

1967

Article

American Museum Novitates 2313:1-23

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Taxonomy:

• Colonoceras agrestis belongs to Hyrachyus modestus - Radinsky (1967)
• Colonoceras belongs to Hyrachyus - Radinsky (1967)
• Ephyrachyus cristalophus belongs to Hyrachyus modestus - Radinsky (1967)
• Hyrachyus agrestis belongs to Hyrachyus modestus - Radinsky (1967)
• Hyrachyus crassidens belongs to Hyrachyus modestus - Radinsky (1967)
• Hyrachyus eximius belongs to Hyrachyus - Radinsky (1967)
• Hyrachyus hypostylus belongs to Hyrachyus eximius - Radinsky (1967)
• Hyrachyus imperialis belongs to Hyrachyus eximius - Radinsky (1967)
• Hyrachyus princeps belongs to Hyrachyus eximius - Radinsky (1967)
• Lophiodon affinis belongs to Hyrachyus modestus - Radinsky (1967)
• Lophiodon bairdianus belongs to Hyrachyus modestus - Radinsky (1967)
• Hyrachyus modestus belongs to Hyrachyus - Radinsky (1967)
• Metahyrachyus bicornutus belongs to Hyrachyus modestus - Radinsky (1967)
• Metahyrachyus troxelli belongs to Hyrachyus eximius - Radinsky (1967)
• Metahyrachyus belongs to Hyrachyus - Radinsky (1967)