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Swiss Journal of Palaeontology
Fig. 5 | Swiss Journal of Palaeontology

Fig. 5

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. 5

Dolorthoceras sp. (PIN-1894/100); River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian. Median conch section. Enlargement of Fig. 4, to show the prismatic ultrastructure of the episeptal cameral deposits, columnar-nacreous ultrastructure of the septum and the irregular mineralization of the continuation of the clutch on the adapical septal surface. Note that both surfaces of the septum show thin whitish unstructured layers that may have been chitinous syn vivo. Scale bar is 10 µm. ch chamber, cl clutch, m matrix, s septum, siph siphuncle

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