In the present work we have shown that we could
simulate and discuss how extinct animal behaved and
evolved, which is not reserved as fossilized remains,
using computer. As a result we have revealed that
Anomcalocaris’ developed overlapping lobe is a logical
consequence of pursuing swimming ability. And we have
shown that Anomalocaris would wave their lobes as
continuous single flap, which is the optimal swimming
motion.
At present time, we observe functionary the same
body plan of Anomalocaris in manta ray whose origin is
totally different from the present case, but we recognize
adaptive evolutionary convergence of the body plan
between them. It is amazing that creature lived in the
period of Cambrian explosion 530 million years
ago already reached to have matured sophisticated
body form.