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Trachyteuthis hastiformis fossilised cuttlebone.
Originally published in: Plumpe Mesoteuthoiden, deren mehr oder weniger Sepiaähnliche Schulpe kräftig verkalkt sind und in der Mittelzone des Rückens höckerige Rauigkeiten zeigen. Typische Art: Trachyteuthis hastiformis(Rüpp). (Vgl Zittel. Grundzüge 1921. p. 595.)
Source: [1]
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