Aptychopsis

 
National Institutes of Health

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1987
1987
Three articulated valves of the genus Aptychopsis are interpreted as the operculum of a nautiloid. The valves are joined by an… (More)
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1978
1978
Turek, Vojtach 1978 04 15: Biological and stratigraphical significance of the Silurian nautiloid Circular or elliptical… (More)
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