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†Cyrtospira Ulrich 1897
urn:lsid:organismnames.com:name:3849883
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dlivicllv
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†Cyrtospira Ulrich 1897
Ulrich 1897. The Lower Silurian Lamellibranchiata of Minnesota. Geological Survey Minnesota, iii(Pt. 2) 1897: pp. 475-628