Diagram of the sutures of Ammonites: A, an elaborate suture (Phylloceras); B, a simple suture (Ceralites); s,s, siphonal; s,v., ventral; s.l., first lateral; s,l', second lateral saddles; t.v. ventral; l, first lateral; l', second lateral loce; La,la, aux
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Diagram of the sutures of Ammonites: A, an elaborate suture (Phylloceras); B, a simple suture (Ceralites); s,s, siphonal; s,v., ventral; s.l., first lateral; s,l', second lateral saddles; t.v. ventral; l, first lateral; l', second lateral loce; La,la, auxiliaty lobes. The arrow points towards the aperture.
