Molecular and morphological evidence of sibling species in Anopheles baileyi Edwards (Diptera: Culicidae) in Bhutan and Thailand

•Four genetically distinct clades, three in Bhutan (Clades I, II and III) and one in Thailand (Clade IV), denoted as species A, B, C and D, respectively, are described.•Species A is most likely the type form of An. baileyi s.s. and the others are unrecognized species•The combination of characteristics of thoracic setae 1,2-P and abdominal seta 3-I was found to be useful for distinguishing the larvae.•The Baileyi Complex has been established for the first time.