Phylogeny of Blattoidea (Dictyoptera: Blattodea) with a revised classification of Blattidae

Abstract

Blattoidea are comprised of the major lineages Blattidae, Lamproblattidae, Tryonicidae, Anaplectidae, and Cryptocercidae + Isoptera. Despite a number of studies, no consensus exists regarding the relationships between these lineages. Additionally, the current division of Blattidae into Archiblattinae, Blattinae, Macrocercinae and Polyzosteriinae needs phylogenetic testing. We present a molecular phylogeny of Blattoidea recovering all the major lineages as monophyletic with Lamproblattidae as sister to the remaining Blattoidea and Tryonicidae as sister to Cryptocercidae + Isoptera. Contrary to many previous studies, we found a high degree of consistency between analyses, possibly due to improved taxon sampling. We found that none of the currently accepted subfamilies of Blattidae are monophyletic. Mapping of distribution revealed a clear geographic structuring at odds with the current subfamilial classification. Based on results from this and other studies, we present a revised classification of Blattidae: we erect two new subfamilies, Eurycotiinaestat. rev. and Austrostylopyginaesubfam. nov., reinstate Duchailluiinaestat. rev. and subsume Macrocercinae in Polyzosteriinae. We also present a division of Polyzosteriinae into tribes: Polyzosteriini, Methaninistat. rev., Rothisilphinitrib. nov., and Celatoblattinitrib. nov. Within Blattidae, Duchailluiinae is sister to the remaining taxa, while Austrostylopyginae is most likely sister to all other Blattidae except Duchailluiinae.