Ancolioceras opalinoides ? (Mayer 1864)
By Ludwigia
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11cm. Murchisonae Zone, Upper Aalenian, Middle Jurassic. Wutach Valley.
This one has almost completely lost its shell revealing the calcified mold showing the suture lines of the phragmacon. These were assigned to the genus Staufenia by Rieber in 1963, but Dietze, Rieber etal have revised the genera in December 2014 to the above.
From the album:
Middle Jurassic Ammonites from Southern Germany
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