Cyclopygidae is a family of asaphid trilobites from 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 do
Cyclopygidae is a family of asaphid trilobites from 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 == thumb|right|Pricyclopyge binodosa, 24mm long, with two characteristic disc shaped hollows on the 3rd thorax segmentThe genera of Cyclopygidae are grouped into the following subfamilies: 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 Ellipsotaphrinae EIlipsotaphrus Whittard, 1952 Psilacella Whittard, 1952 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 Genera previously assigned to Cyclopygidae Girvanopyge (Remopleurididae)
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