Likhitrakarn N.Golovatch S.I.Thi S.Sophea C.Lou V.Sinovas P.Jeratthitikul E.Pholyotha A.Siriwut W.Srisonchai R.Panha S.Sutcharit C.Mahidol University2025-10-122025-10-122025-01-01Zookeys No.1251 (2025) , 251-27413132989https://repository.li.mahidol.ac.th/handle/123456789/112507The Southeast Asian millipede genus Orthomorpha Bollman, 1893 currently encompasses 59 accepted species, including three newly described from Cambodia: Orthomorpha tergoaurantia Likhitrakarn, sp. nov., Orthomorpha efefai Likhitrakarn, sp. nov., and Orthomorpha battambangiensis Likhitrakarn, sp. nov. The new species are described based on distinctive morphological traits, with particular emphasis on gonopodal features. Species descriptions are accompanied by detailed illustrations and scanning electron micrographs (SEM) of the gonopods. An updated identification key to the known Orthomorpha species from Cambodia is also provided.Earth and Planetary SciencesAgricultural and Biological SciencesArticleSCOPUS10.3897/zookeys.1251.1587762-s2.0-10501784558713132970