A new species of Treintamilun (Odonata: Frenguelliidae) from the early Eocene of Laguna del Hunco, Patagonia, Argentina

The Frenguelliidae Petrulevičius & Nel, 2003 is an endemic family of Odonata recorded from the Eocene of Patagonia, Argentina. They are only present in the lower Eocene (52 Ma) of Laguna del Hunco, the middle Eocene (47 Ma) of Río Pichileufú, and Arroyo Chacay (no absolute dating). The family consists of four genera and six species, namely Frenguellia patagonica Petrulevičius and Nel, 2003, F. iglesiasi Petrulevičius and Nel, 2013, Treintamilun vuelvenlucha Petrulevičius, 2017, Nelala chori Petrulevičius, 2019, N. chacay Petrulevičius, 2023, and Chacayala campeona Petrulevičius, 2022.