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... and umbilical lobes, and ventral lobes bifurcated , Lateral lobes bifurcated or trifurcated, Jurassic-Cretaceous.
Below the order and suborder, it is further divided into 80 superfamilies, 280 families and 2000 genera, as well as many species and subspecies.
For a long time, many scholars speculated that the ammonites with convoluted shells evolved from straight-shelled rodites, which gradually curved into annular-shelled ammonites.
However, stratigraphic evidence suggests t ...
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