Abstract
Members of the tribe Podismini (Orthoptera: Acrididae: Melanoplinae) are distributed mainly in Eurasia and the western and eastern regions of North America. The primary aim of this study is to explore the phylogenetic relationship of Japanese Podismini grasshoppers by comparing partial sequences of cytochrome c oxidase subunit I (COI) mitochondrial gene. Forty podismine species (including nineteen Japanese species) and thirty-seven species from other tribes of the Melanoplinae (Dactylotini, Dichroplini, Melanoplini, and Jivarini) were used in the analyses. All the Japanese Podismini, except Anapodisma, were placed in a well-supported subclade. However, our results did not correspond with the classification on the basis of morphological similarity for the status of Tonkinacridina. This group of Japanese species constituted a single clade with other species of Miramellina and Podismina, while Eurasian continental species of Tonkinacridina were placed in other separate clades. This incongruence might have resulted from historical migratory events between continent and ancient islands and subsequent convergent/parallel evolution in morphology. Some remarks on phylogenetic positions in Podismini and other tribes were also made in terms of reconstructed phylogeny.
Highlights
The tribe Podismini Jacobson, 1905 is one of the five tribes belonging to the acridid subfamily Melanoplinae Scudder, 1897 (Cigliano et al 2017)
The primary aim of this study is to explore the phylogenetic relationship of Japanese Podismini grasshoppers by comparing partial sequences of cytochrome c oxidase subunit I (COI) mitochondrial gene
The Bayesian inference and maximum likelihood analyses resulted in similar trees, the only differences between them being the degree of statistical support for the recovered nodes (Fig. 2)
Summary
The tribe Podismini Jacobson, 1905 is one of the five tribes belonging to the acridid subfamily Melanoplinae Scudder, 1897 (Cigliano et al 2017). Podismini genera are distributed in the Palearctic and Nearctic region (Vickery 1987). They usually occur in grassland and scrub formations. Podismini is currently divided into three subtribes: Miramellina (Rehn & Randell, 1963), Podismina (Jacobson, 1905), and Tonkinacridina (Ito, 2015). The genus group Bradynotae (Rehn & Randell, 1963) and another 21 genera have been considered as members of this tribe, but they have not yet been included in the subtribes (Cigliano et al 2017)
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