The taxonomic status of the kukri snake Oligodon arenarius Vassilieva, 2015 with a redescription of Oligodon macrurus (Angel, 1927) (Squamata, Serpentes, Colubridae)

We investigated the taxonomic status of recently described kukri snake Oligodon arenarius Vassilieva, 2015 and morphologically similar macrurus (Angel, 1927), two species endemic to southern coast Vietnam. Based on phylogenetic analyses using three mitochondrial genes (12S–16S rRNA, cytochrome b ), we recovered O. in a clade within cyclurus-taeniatus group, agreeing with previous intrageneric classifications. Genetic distances between are extremely low (less than 0.5% based 12S–16S) render paraphyletic. All preserved specimens convey little no differences color pattern, hemipenial morphology osteological features; latter which is dimensional micro computer tomography (µCT) scans one specimen per species. Contrasting these results, univariate multivariate revealed significant relative tail length, number ventral subcaudal scales both Although molecular morphological datasets present conflicting integrating evidence leads us synonymize . provide formal redescription , designate neotype avoid future confusion, first detailed description this sensu stricto coastal dunefields adjacent forest habitats Vietnam, where ongoing human development, tourism road mortality pose threats its conservation. Consequently, suggest that should be listed as “Vulnerable” assessment criteria International Union for Conservation Nature (IUCN).