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Swiss Journal of Palaeontology
Fig. 7 | Swiss Journal of Palaeontology

Fig. 7

From: Siphonal tube structure of the Late Devonian orthocerid Dolorthoceras from the Polar Urals (NW Russia) preserving nacre and organic fibres as well as its persistence in cephalopod evolution

Fig. 7

Dolorthoceras sp. (PIN-1894/100); River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian. Median conch section. The different fossilization of the biomineralized columnar-nacreous septal neck (to the right) and the primarily organic fibrous lens shaped structure (sectioned clutch) coating its posterior part. Scale bar is 30 µm. ls lens shaped structure, m matrix, sn septal neck

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