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Fig. 4. Comparison of quantitative model of morphological diversity with data from
660 extant species of medusae. (A) Black circles, morphological data; solid
blue curve, 0.5 Hz swimming frequency model; solid red curve, 1 Hz model;
solid green curve, 2 Hz model. Broken red curve, model prediction in the
absence of stopping vortex formation at 1 Hz. (B) Black circles, morphological
data; solid blue curve, morphospace limit corresponding to an order of
magnitude increase (10 times) in the physiologically available force
FM for the model with 0.5 Hz swimming frequency; solid
green curve, morphospace limit corresponding to an order of magnitude decrease
(0.1 times) in the physiologically available force FM for
the model with 2 Hz swimming frequency; red curve, 1 Hz model corresponding to
average physiological data. fCRIT, critical fitness
ratio.