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Stylonuroidea are an extinct superfamily of eurypterids. They were members of the subphylum Chelicerata. Stylonuroidea, which lived from the Ordovician to Lower Permian periods, were characterized by their last pair of prosomal (head) appendages, which were developed as walking legs, or less commonly developed as swimming legs with paddles formed by the expansion of the two or three penultimate joints.〔 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P36. as Stylonuracea〕 ==Families and genera== *Class Merostomata Dana, 1852 *Order Eurypterida Burmeister, 1843 *Superfamily Stylonuroidea Diener, 1924 *Family (2): : *Parastylonuridae Waterston, 1979 :: *''Parastylonurus'' Kjellesvig-Waering, 1966 :: *''Stylonurella'' Kjellesvig-Waering, 1966 : *Stylonuridae Diener, 1924 :: *''Ctenopterus'' Clarke & Ruedermann, 1912 :: *''Laurieipterus'' Kjellesvig-Waering, 1966 :: *''Pagea'' Waterston, 1962 :: *''Stylonurus'' Page, 1856 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「Stylonuroidea」の詳細全文を読む スポンサード リンク
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