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Swiss Journal of Palaeontology
Fig. 7 | Swiss Journal of Palaeontology

Fig. 7

From: Ontogeny and morphology of the retrochoanitic septal necks of Agoniatites vanuxemi from the Middle Devonian Cherry Valley Limestone

Fig. 7

Agoniatites vanuxemi. PRI 68139. a Septal neck in the second whorl. Scale bar 100 μm. b–d Septal necks in the third whorl. b Two septal necks. The length of the dorsal extension of the septal neck into the chamber is visible in this view. Scale bar 20 μm. c Close-up of septal neck in b (1). Adoral extent of dorsal side of septal neck is marked by a star. Scale bar 200 μm. d Close-up of septal neck in b (2). Adoral extent of dorsal side of septal neck is marked by a star. Auxiliary deposits are preserved. Scale bar 200 μm. S septum, V venter, DSN dorsal part of septal neck, VSN ventral part of septal neck, aux auxiliary deposits, arrow adoral direction

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