Fig. 6From: Another lesson from beautiful monsters: the case of 'sex reversals' in the Ammonoidea and their significanceDrawing of the six ornamental stages (i to vi) of Peltoceras athleta as defined by Bonnot [25] on specimens (A) mbe.9305, and (B): mbe.1401. Black dots indicate the end of the phragmocone. Scale bar is 10 mmBack to article page