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Stenopterygius
''Stenopterygius'' is an extinct genus of thunnosaur ichthyosaur known from Europe (England, France, Germany, Luxembourg and Switzerland). Maximum length was .〔〔Huene F. von 1939. Ein ganzes Ichthyosaurier-Skelett aus den westschweizerischen Voralpen. ''Mitteilungen der Naturforschenden Gesellschaft in Bern'' 1939, pp.: 1-14〕〔McGowan C, Motani R. 2003. Ichthyopterygia. – In: Sues, H.-D. (ed.): ''Handbook of Paleoherpetology, Part 8, Verlag Dr. Friedrich Pfeil'', 175 pp., 101 figs., 19 plts; München〕
==Description==
''Stenopterygius'' was physically similar to the better known ''Ichthyosaurus'', but had a smaller skull and narrower flippers. Beautifully preserved fossils of ''Stenopterygius'' have been found in Germany.〔Martill D.M. 1993. Soupy Substrates: A Medium for the Exceptional Preservation of Ichthyosaurs of the Posidonia Shale (Lower Jurassic) of Germany. ''Kaupia - Darmstädter Beiträge zur Naturgeschichte'' 2: 77-97〕 Its skull was extended into a kind of a beak and was armed with a quantity of large teeth. The limbs had been transformed to fin-like structures. The tail terminated in a large, semicircular, leathery, vertical caudal fin and even a triangular dorsal fin was present.
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