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... and the next wall extends toward the shell mouth.
In addition, the most important thing is that the ammonite has complex sutures, while the nautilus has no sutures. It is the line between the ammonite next door and the inner surface of the shell wall.
The sutures of other cephalopods are simple arcs or straight lines.
But the sutures of ammonites are quite complicated, so any description and classification of ammonites must be based on the discussion of sutures.
The ...
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