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Pricyclopyge
''Pricyclopyge'' is a genus of trilobite assigned to the Cyclopygidae family that occurs throughout the Ordovician. ''Pricyclopyge'' had an (extratropical ) distribution, and there is evidence that it lived in darker parts of the water column (around 175m deep). ''Pricyclopyge'' has huge eyes, an inverted pear-shaped glabella, six thorax segments, with on the 3rd two small discs.〔Whittington, H. B. et al. (1997) Treatise on Invertebrate Paleontology. Part O, Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida.〕 ''Pricyclopyge'' is known from what are today China, the Czech Republic, France, and the United Kingdom.〔Paleobiology Database〕
== Description ==
Like other cyclopygids, ''Pricyclopyge'' lacks genal spines. ''Pricyclopyge'' has six thorax segments of which the third from the front carries two very characteristic round discs that are presumed to have been bioluminescent organs, and if true, this suggests that ''Pricyclopyge'' swam upside down. It has a wide and stout axis, that tapers gradually backwards until it ends in a semicircle close to the border of the pygidium. The short side lobes (or pleurae) of the thorax segments gradually become wider further back so that the thorax is widest at its back, with the tips of the pleurae of the 6th segment sometimes enlarged, bent backwards and so bordering the pygidium.〔 The pygidium is more than twice as wide as long, the axis showing 3 or 4 clearly defined rings, while segmentation of the pleural area is barely visible. The pygidial border furrow is clear.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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