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

Fig. 10

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

Fig. 10

Three-dimensional view of septal necks in Agoniatites vanuxemi. a View of septal neck. b Close-up of ventral side of septal neck showing the placement of the septal–siphuncular membranes. S septum, SN septal neck, aux auxiliary deposits, VW ventral shell wall, ST siphuncular tube, SSM septal–siphuncular membranes. Arrow adoral direction. Modified from Tanabe and Landman (1996, fig. 1)

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