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†Plethospira extensa Heller 1954
urn:lsid:organismnames.com:name:2845600
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†Plethospira extensa Heller 1954
Heller 1954. Stratigraphy and paleontology of the Roubidoux formation of Missouri. Biennial Report Mo Bur Geol Min (2), 35 1954: 28-42