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Figure 13.3 Two hypotheses for the formation of 13- and 17-year lineages of the Magicicada
septendecim , tredecim , and neotredecim group. A) The evolution of neotredecim involved one evolution-
ary event (labeled 2). B) Alternatively, the evolution of neotredecim involved two separate events
(labeled 2 and 3). The models assume that tredecim populations were ancestral in both cases.
(Modified from Simon et al. 2000 . )
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