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The Cyclopygidae comprise a family of trilobites that is confined to the Ordovician. Cyclopygids had an (extratropical ) distribution, and there is evidence that they lived in darker parts of the water column (around 175m deep). Cyclopygids are characterized by enlarged eyes, with a wide angle of view, both horizontal and vertical, reminiscent of the eyes of dragonflies. These typically touch the glabella directly on the side. Cyclopygids all lack genal spines, but ''Symphysops'' carries a forward directed frontal spine on the glabella. It is presumed that at least the members of the genus ''Pricyclopyge'' swam upside down and had bioluminescent organs on the third thorax segment. Cyclopygids had between 7 and 5 thorax segments, a wide and stout axis, and short side lobes (or pleurae). == Taxonomy == The following genera are assigned to the Cyclopygidae: Subfamily Cyclopyginae * ''Cyclopyge'' Hawle & Corda, 1847 * ''Delgamella'' Marek, 1961 * ''Gastropolus'' Whittard, 1966 * ''Heterocyclopyge'' Marek, 1961 * ''Microparia'' Hawle & Corda, 1847 * ''Novakella'' Whittard, 1952? * ''Prospectatrix'' Fortey, 1981 * ''Sagavia'' Koroleva, 1967 Subfamily Ellipsotaphrinae * ''EIlipsotaphrus'' Whittard, 1952 * ''Psilacella'' Whittard, 1952 Subfamily Pricyclopyginae * ''Pricyclopyge'' Richter & Richter, 1954 * ''Circulocrania'' Fortey, 1987 * ''Emmrichops'' Marek, 1961 * ''Symphysops'' Raymond, 1925 Assignment unclear * ''Aspidaeglina'' Holub, 1911 * ''Phylacops'' Cooper & Kindle, 1936 * ''Xenocyclopyge'' Lu, 1962 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「Cyclopygidae」の詳細全文を読む スポンサード リンク
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