This research focuses on the ambrosia beetles of the subfamily Scolytinae with a particular emphasis on the Sueus genus within the Hyorrhynchini tribe, aiming to clarify their evolutionary history and taxonomic relationships. It employs both morphological and molecular analyses to investigate the phylogenetic relationships within Sueus, leading to the identification of a new species and the reevaluation of existing classifications. Specimens for this study were sourced from both international collections and field expeditions across Southeast Asia. The morphological study utilized Leica stereomicroscopes for detailed examinations, while the molecular analysis involved DNA extractions, followed by PCR amplification and sequencing of cytochrome oxidase I (COI) and carbamoyl-phosphate synthetase 2, aspartate transcarbamylase, and dihydroorotase (CAD) genes. This dual approach facilitated the identification of 18 distinct morphological characteristics and unique DNA sequences, enabling the clarification of evolutionary relationships within Sueus. The findings include the identification of a new species, S. insulanus, the transfer of S. granulatus to Sueus from Hyorrhynchus, and the resurrection of S. pilosus. The research underscores the importance of these beetles in forest ecosystems and pest management strategies. It advocates for further studies on the microbiomes of Sueus, the potential impacts of climate change on their distribution, and the engagement of citizen science in tracking and managing invasive species.
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