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Phacops rana
''Phacops rana'' (''Eldredgeops rana'') is a species of trilobite from the middle Devonian period. Their fossils are found chiefly in the northeastern United States, southwestern Ontario, and in Morocco.
== Description ==
''Phacops rana'' can be recognized by its large eyes (which remind some observers of a frog's eyes — the specific name ''rana'' is a reference to a common frog), its fairly large size (up to 6 inches long), and its habit of rolling up into a ball like a pill bug. In order to protect themselves from predators, ''Phacops rana'' would roll into a ball with its hard exoskeleton on the outside as protection. Many other trilobites possessed the same ability, but ''Phacops rana'' nearly perfected it. The slightest amount of sediment would trigger their senses, and ''Phacops rana'' would be hidden in a tiny shelter made of its own body. Although this safety feature often helped them to evade predators, occasionally it backfired and the trilobite would be buried under heavy sediment. Their fossils can still be found in balled-up positions 400 million years later.
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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