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Ursaspongia Rigby 1985
urn:lsid:organismnames.com:name:511951
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451
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Ursaspongia Rigby 1985
Rigby 1985. The sponge fauna from the Mississipian Heath Formation of Central Montana. Congres International de Stratigraphie et de Geologie du Carbonifere Compte Rendu, 9(5) 1985: 443-456