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	Tristichopterus alatus  Tristichopterus alatus
	Tristichopterus alatus was a lobe-finned fish which lived during the Devonian period, first found in the Orkney Islands of Scotland and described by Egerton (1861). Tristichopterus belongs to the class Sarcopterygii and family Tristichopteridae.  Tristichopteridae, including 13 named genera, were a diverse and successful group of tetrapodomorph fishes who first appeared in the Givetian stage of the Middle Devonian (387-382 mya). Their sizes ranged from about 30 cm, in the case of Tristichopterus, up to several meters in length in Hyneria and Eusthenodon. All tristichopterids went extinct by the end of Late Devonian (360 mya).   T. alatus resembles a smaller version of  the well-known tetrapodomorph species Eusthenoptheron foordi described by Erik Jarvik (1980), also in the Tristichopteridae family. References: Egerton, P.M.G. 1861. Tristichopterus alatus. Memoirs of the Geological Survey of the U.K., Figures and Descriptions Illustrative of British Organic Remains 10:51-55. Jarvik, E. 1980. Basic Structure and Evolution of Vertebrates.
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