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Swiss Journal of Palaeontology
Fig. 1 | Swiss Journal of Palaeontology

Fig. 1

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. 1

Dolorthoceras sp. (PIN-1894/100); River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian. Median conch section. The two last chambers containing cameral deposits, which are missing from the next chambers of the phragmocone. Note that in the right chamber, thin episeptal cameral deposits coat about half of the septal length but the mural deposits are about as thick as the shell wall; in the preceding chamber, the episeptal and mural deposits are thick, whereas the hyposeptal deposits are missing. Scale bar is 0.3 µm. ch chamber, esd episeptal cameral deposits, m matrix, mural cameral deposits, s septum, sn septal neck, sw shell wall

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