Serpula circinnalis (Muenster in Goldfuss)
Up to 5cm. long. On a very large Pachylytoceras jourdani ammonite from the upper Aalenian at the Lafarge Quarry in Belmont near Lyon, France.
By Ludwigia
Up to 5cm. long. On a very large Pachylytoceras jourdani ammonite from the upper Aalenian at the Lafarge Quarry in Belmont near Lyon, France.
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