Abstract
The article demonstrates that the collosphaerid radiolarian species Siphonosphaera arkys Su, 1982 from the Quaternary of China is a junior synonym of Siphonosphaera brachysiphonia Dumitrică, 1978, described from the late Middle Miocene Radiolarian Shale Formation from the Getic Depression, Romania. This species is re-illustrated with additional photos at optical microscope and drawings to a better understanding of its morphology.
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