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Articles • Rev. Bras. entomol. 68 (4) • 2024 • https://doi.org/10.1590/1806-9665-RBENT-2024-0055 linkcopy

Open-access The usefulness of geometric morphometrics for differentiating polymorphic flea beetles

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    ABSTRACT

    Oedionychina Chapuis, 1875 is a diverse subtribe of Alticini leaf beetles, posing challenges and complexity in study due to mimicry and poorly informative descriptions. Herein, we propose geometric morphometrics as a tool for identifying polymorphic species of Alagoasa Bechyně, 1955, without the need for dissection. Thirteen anatomical landmarks on the thorax were applied to Alagoasa decemguttata (Fabricius, 1801), Alagoasa plaumanni Bechyně, 1955, and Alagoasa scissa (Germar, 1824). Canonical Variate Analysis (CVA) graphs effectively distinguished the three species. The most pronounced shape differences were observed between A. decemguttata and A. plaumanni, and between A. decemguttata and A. scissa. No shape variation was detected between A. plaumanni and A. scissa in the deformation grid. Geometric morphometrics proved to be a more precise method for describing and quantifying morphological differences in the thoracic shape of polymorphic Alagoasa beetles.

    Keywords:  Oedionychina; Pronotum; Landmarks; Morphology

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