Xenomorph Gryphaea arcuata (Lamarck 1801)
5.5cm. This right valve grew over an Arietites ammonite leaving the impressed form of the ammonite on the shell. From the Sinemurian in the region around Balingen.
By Ludwigia
5.5cm. This right valve grew over an Arietites ammonite leaving the impressed form of the ammonite on the shell. From the Sinemurian in the region around Balingen.
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