| independent divergence of 13- and 17-y life cycles among three periodical cicada lineages. | the evolution of 13- and 17-y periodical cicadas (magicicada) is enigmatic because at any given location, up to three distinct species groups (decim, cassini, decula) with synchronized life cycles are involved. each species group is divided into one 13- and one 17-y species with the exception of the decim group, which contains two 13-y species-13-y species are magicicada tredecim, magicicada neotredecim, magicicada tredecassini, and magicicada tredecula; and 17-y species are magicicada septendec ... | 2013 | 23509294 |