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Ammagnostidae is a family of trilobites in the suborder Agnostina, small, eyeless, isopygous trilobites with a thorax consisting of 2 segments only. Four genera have been assigned to it: ;''Ammagnostus'' Öpik, 1967 *''Ammagnostus psammius'' Öpik, 1967 (Type) *''Ammagnostus bassus'' (Öpik, 1967) *''Ammagnostus bella'' Guo & Luo, 1996 *''Ammagnostus beltensis'' (Lochman, 1944) *''Ammagnostus cryptus'' *''Ammagnostus cylindratus'' Guo & Luo, 1996 *''Ammagnostus duibianensis'' Lu & Lin, 1989 *''Ammagnostus histus'' *''Ammagnostus hunanensis'' *''Ammagnostus integriceps'' Öpik, 1967 *''Ammagnostus laiwuensis'' (Lorenz, 1906) *''Ammagnostus mitis'' Öpik, 1967 *''Ammagnostus sinensis'' Peng, 1987 *''Ammagnostus wangcunensis'' Peng & Robison ;''Hadragnostus'' Öpik, 1967 *''Hadragnostus las'' Öpik, 1967 (Type) *''Hadragnostus edax'' Fortey & Rushton, 1976 *''Hadragnostus helixensis'' Jago & Cooper, 2005 *''Hadragnostus modestus'' (Lochman, 1944) ;''Kormagnostus'' Resser, 1938 *''Kormagnostus sinplex'' Resser, 1938 (Type) *''Kormagnostus boltoni'' Westrop ''et al.'', 1996 *''Kormagnostus copelandi'' Westrop ''et al.'', 1996 *''Kormagnostus flati'' Pratt, 1992 *''Kormagnostus inventus'' Shergold, 1982 *''Kormagnostus minutus'' (Schrank, 1975) *''Kormagnostus seclusus'' (Walcott, 1884) ;''Proagnostus'' Butts, 1926 *''Proagnostus bulbus'' Butts, 1926 (Type) *''Proagnostus centerensis'' Resser, 1938 *''Proagnostus maryvillensis'' Resser They lived during the late Cambrian period to the Ordovician period. == References == * http://www.biolib.cz/en/taxon/id456979/ * http://www.trilobites.info/ordagnostida.htm 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「Ammagnostidae」の詳細全文を読む スポンサード リンク
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