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

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.