Contribution to the knowledge of the Odonata fauna of Khao Yai National Park and the adjacent regions in Thailand

The diversity and distribution of dragonflies and damselflies were investigated at Khao Yai National Park (KYNP) during January 2019 – March 2022. Adults and larvae of 78 species were collected from 26 sampling sites including lotic and lentic habitats. The updated odonate checklist of KYNP and adjacent areas brings the total number of species from 109 to 142 species, of which 33 species are new records. The Libellulidae account for more than one third of the regional fauna with the highest number of species, followed by Coenagrionidae, Gomphidae, and Platycnemididae, respectively. Differences between the numbers of Odonata species recorded using larval records, adult records, and observational and photographic records are discussed. Multivariate analyses were performed which revealed a strong correlation between the habitat types (lotic, lentic and “mixed” water bodies) and odonate species present. Species richness between those three habitat types was similar. Two-way cluster analysis showed a strong association between three groups of odonate species and three groups of microhabitats (rocky-lotic, debris-riparian-lotic, lentic habitats).