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Swiss Journal of Palaeontology
Fig. 2 | Swiss Journal of Palaeontology

Fig. 2

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. 2

Dolorthoceras sp. (PIN-1894/100); River Malaya Usa, Polar Urals, NW Russia; Frasnian, Late Devonian. Median conch section. A detail of the siphonal tube to show thin, supposedly chitinous, connecting rings, short columnar-nacreous septal necks, and non-biomineralized fibrous lens shaped structures (sectioned clutch). Scale bar is 0.1 mm. ch chamber, cr connecting ring, ls lens-shaped structure, s septum, siph siphuncle, sn septal neck

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