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Swiss Journal of Palaeontology
Fig. 10 | Swiss Journal of Palaeontology

Fig. 10

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. 10

A schematic drawing of the siphonal tube structures in a, bDolorthoceras sp. River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian, and c, dZuravlevia insperata NW Caucasus, south part of Central Russia; Aptian, Early Cretaceous (after Doguzhaeva 1994; modified). bch, body chamber, ch chamber, cl, clutch, cr connecting ring, s septum, siph siphuncle, sn septal neck, sw shell wall

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