Distribution of Rhynchocalamus hejazicus sp. nov. showing the location of the material examined in this study. Circles indicate samples used for the genetic analyses, squares indicate examined voucher specimens, and diamonds indicate photographic records. The black arrow denotes the type locality (Shaaran NR in AlUla County, Medina Province). Geographical sampling is overlaid by the predicted species distribution model categorised into binary predictions of the suitable areas. The threshold used for the categorisation was the lowest predicted suitability value among the occurrence points (= 0.05).