Historical classification and nomenclature of Hawaiian damselflies (Pinapinao, Odonata: Coenagrionidae: Megalagrion): a review

Historical classification and nomenclature of Hawaiian damselflies (Pinapinao, Odonata: Coenagrionidae: Megalagrion): a review 00

Robert K. Hadfielda ✉️ , Laura N. Sutherlanda, Dallin Flakea, Dan Polhemusb, Steve Jordanc, Seth M. Bybeea

  1. Department of Biology, Brigham Young University, 4102 LSB, Provo, UT 84602, USA, Bean Life Science Museum, Brigham Young University, Provo, UT 84602, USA
  2. Department of Natural Sciences, Bishop Museum, 1529 Bernice St., Honolulu, HI 96734, USA
  3. Department of Biology, Bucknell University, One Dent Drive, Lewisburg, PA 17837, USA

International Journal of Odonatology, Volume 28, Pages 132-145, 2025

https://doi.org/10.48156/1388.2025.1917343

Published: 13 October 2025 (Received: 3 May 2025, Accepted: 22 September 2025)

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Abstract

The endemic Hawaiian damselflies of the genus Megalagrion have a complex taxonomic history. Classification within Megalagrion has predominantly focused on morphology and geography, followed by more recent and extensive molecular work. This combined effort has increased our understanding of the group, provided insight into existing taxonomic questions, and raised new questions. Here we outline the historical classification and nomenclature leading up to the present understanding of Megalagrion. Additionally, we discuss taxonomic issues that remain and make recommendations for future work.

Keywords: Damselfly, dragonfly, Hawaiʻi, systematics, taxonomy, Megalagrion, pinao

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