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Fig. 9 | Swiss Journal of Palaeontology

Fig. 9

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. 9

A schematic drawing of the siphonal tube structure in Dolorthoceras sp. (PIN-1894/100); River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian. Scale bar is 30 µm. ch chamber, cl clutch, cr connecting ring, hse hyposeptal extension of the clutch along with connecting ring, icl inner part of clutch, s septum, siph siphuncle, ocl outer part of clutch

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