Photo: National Park Service, Fossil Butte National Monument
- Order
- Hiodontiformes
- Family
- Hiodontidae
- Size
- Mostly 4–6 in; some up to about 10 in
A near-shore Fossil Lake mooneye related to living North American Hiodon species.
There are 2 living species of the Hiodon genus that are found in freshwater in North America. They reach about 20 inches in length and feed primarily on insects. Fossil specimens of the Hiodon genus are known from both North America and Asia.
H. falcatus is almost exclusively found in near-shore sediment from Fossil Lake. Most specimens are between 4 and 6 inches long, though some are as large as 10 inches.
Species text: National Park Service, Fossil Butte National Monument — Fossil Fish Species.