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Isoxys
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''Isoxys'' is a genus of extinct, pelagic bivalved arthropod; the various species may have been free-swimming predators. It had a pair of large spherical eyes (which are the most commonly preserved feature of the soft-bodied anatomy), and two large appendages, which have led to speculation that it may be related to the great appendage arthropods.〔
== Ecology ==
''Isoxys'' was abundant in tropical seas, and may have had a global distribution.〔 Eyes of different specimens appear to have been adapted to different light intensities; one specimen of ''I. auritus'' was either crepuscular in shallow water, or lived in waters around 140 m below the sea surface; whereas another was morphologically adapted to a diurnal light intensity in shallow waters. It is likely that ''Isoxys'' was a visual predator that hunted swimming above the seafloor. It had powerful prehensile frontal appendages and large spherical eyes. Isoxys could propel itself by the beating possibly 14 flippered swimming legs (setose exopods) and steer with a flap-like tail (or telson).〔
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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