The debate on the homologization of the wing venation of Orthoptera and some stem-Orthoptera is connected to the ques- tion of insect wing venation groundplan. This broader topic can be seen as the ‘serial paradigm’ vs. the ‘M5 paradigm’ debate. Unlike implied elsewhere, it is demonstrated that homology hypotheses developed under the two different para- digms have signifi cantly different implications in terms of phylogeny, hence evolutive history at the level of Pterygota. Evidence in support of one paradigm or the other is critically reviewed. Wing veins that are arguably not homologous have been interpreted as M5 based on superfi cial similarity, and these interpretations do not withstand scrutiny. Based upon our current knowledge, the serial pattern is to be preferred.
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