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Any hope that the pierines would help to define “the level at which r-K phenomena should be sought has been dashed: apparently species groups (or subgenera, or splitters' genera) are r- or K-selected in the holarctic, whereas in Tatochila the same amount of differentiation is found among populations in a complex in which the process of speciation has not yet been completed.
Source: wiktionary
Using this approach, a recent study that included genetic data from four of the new species described here proposed that tetraploidization occurred at least once in subgenus Silurana and once in subgenus Xenopus, octoploidization occurred at least three times in subgenus Xenopus, and that dodecaploidization occurred at least three times in subgenus Xenopus [21 ].
Source: wiktionary