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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Aspidorhynchus ： ウィキペディア英語版 Aspidorhynchus ''Aspidorhynchus'' (meaning "shield snout") is an extinct genus of ray-finned fish from the Jurassic and Cretaceous periods. Fossils have been found in Europe and Antarctica. ''Aspidorhynchus'' was a slender, fast-swimming fish, long, with tooth-lined, elongated jaws. It also had heavy scales and a symmetrical tail. The upper jaw was longer than the lower jaw, ending in a toothless spike. Although it would have looked superficially similar to the present day gar, its closest living relative is actually the bowfin. ==Ecology== Several limestone slabs have been discovered in which fossils of ''Rhamphorhynchus'' are found in close association with ''Aspidorhynchus''. In one of these specimens, the jaws of an ''Aspidorhynchus'' pass through the wings of the ''Rhamphorhynchus'' specimen. The ''Rhamphorhynchus'' also has the remains of a small fish, possibly ''Leptolepides'', in its throat. This slab, cataloged as WDC CSG 255, may represent two levels of predation; one by ''Rhamphorhynchus'' and one by ''Aspidorhynchus''. In a 2012 description of WDC CSG 255, researchers proposed that the ''Rhamphorhynchus'' individual had just caught a ''Leptolepides'' while it was flying low over a body of water. As the ''Leptolepides'' was travelling down its pharynx, a large ''Aspidorhynchus'' would have attacked from below the water, puncturing the left wing membrane of the ''Rhamphorhynchus'' with its sharp rostrum. The teeth in its snout were ensnared in the fibrous tissue of the wing membrane, and as the fish thrashed to release itself the left wing of ''Rhamphorhynchus'' was pulled backward into the distorted position seen in the fossil. The encounter resulted in the death of both individuals, most likely because the two animals sank into an anoxic layer in the water body, depriving the fish of oxygen. The two may have been preserved together as the weight of the head of ''Aspidorhynchus'' held down the much lighter body of ''Rhamphorhynchus''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aspidorhynchus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.