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†Pachysphaeridium sidereum Ribecai & Tongiorgi 1999
urn:lsid:organismnames.com:name:1822702
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133
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†Pachysphaeridium sidereum Ribecai & Tongiorgi 1999
Ribecai & Tongiorgi 1999. The Ordovician acritarch genus Pachysphaeridium Burmann 1970: new, revised, and reassigned species. Palaeontographia Italica, 86 1999: 113-153