ZooKeys 1032: 1–15 (2021) A peer-reviewed open-access journal doi: 10.3897/zookeys.1032.64917 RESEARCH ARTICLE https://zookeys.pensoft.net Launched to accelerate biodiversity research Mountainous millipedes in Vietnam. I. Two new species of the family Paradoxosomatidae from Mount Fansipan (Diplopoda, Polydesmida) Anh D. Nguyen1,2, Dai Dac Nguyen1,3, Katsuyuki Eguchi3 1 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoangquocvi- et Rd., Caugiay District, Hanoi, Vietnam 2 Graduate University of Science and Technology, Vietnam Acad- emy of Science and Technology, 18, Hoangquocviet Rd., Caugiay District, Hanoi, Vietnam 3 Department of Biological Sciences, Faculty of Sciences, Tokyo Metropolitan University, Hachioji-shi, Tokyo Prefecture, Japan Corresponding author: Anh D. Nguyen (
[email protected]) Academic editor: D. V. Spiegel | Received 24 February 2021 | Accepted 23 March 2021 | Published 16 April 2021 http://zoobank.org/E45C61A8-6565-4AB5-B5FC-AD907A9B4738 Citation: Nguyen AD, Nguyen D-D, Eguchi K (2021) Mountainous millipedes in Vietnam. I. Two new species of the family Paradoxosomatidae from Mount Fansipan (Diplopoda, Polydesmida). ZooKeys 1032: 1–15. https://doi. org/10.3897/zookeys.1032.64917 Abstract Two new paradoxosomatid millipede species were discovered at the high elevations of Mount Fansipan in northwestern Vietnam. They are named as Orthomorphoides sapa sp. nov. and Hylomus solenophorus sp. nov. In addition to their morphological descriptions, sequences from fragments of two mitochondrial genes, COI and 16S rRNA, are also provided for both new species. Keywords Biodiversity, COI, 16S rRNA, new species, northwest Vietnam, taxonomy Introduction At least three-quarters of Vietnam’s landscape is covered by mountains and hills (Le Ba Thao 2017).