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Temporal range: Lower Devonian to Recent
They may be the "oldest and most enigmatic groups of fishes alive today. Their closest living relatives are sharks, though in evolutionary terms they branched off from sharks nearly 400 million years ago and have remained isolated ever since.
- Froese, Rainer, and Daniel Pauly, eds. (2009). "Chimaeriformes" in FishBase. January 2009 version. 
- "Ancient and bizarre fish discovered: new species Of ghostshark from California and Baja California". ScienceDaily. September 23, 2009. http://www.sciencedaily.com/releases/2009/09/090922095816.htm. Retrieved 2009-09-23.