Figure 4
From: Suture pattern formation in ammonites and the unknown rear mantle structure
Comparison of the budding of the septa of Damesites cf. damesi and the cerata of Tritoniopsis elegans.
(a) Diagonally upward view of a septa of NMA00802. (b–e) The budding process of the septal arms in the blue square of (a). 1st, 18th, 23rd and 40th septa of forty consecutive septa. (f) Dorsal view of Tritoniopsis elegans. (g–j) The budding process of the cerata in the green square of (f). Observations performed every three days. White and red arrowheads indicate new septal arms between the arms/cerata and adjacent to them, respectively. Scale bars, 1 mm.
