Review of the millipede genus Malayorthomorpha Mrsic, 1996 (Diplopoda, Polydesmida, Paradoxosomatidae), with descriptions of two new species from Thailand and a key to its species Author Likhitrakarn, Natdanai https://orcid.org/0000-0002-1306-317X Program of Agriculture, Faculty of Agricultural Production, Maejo University, Chiang Mai, 50290, Thailand Author Golovatch, Sergei I. Biodiversity and Utilization Research Center of Maejo University, Maejo University, Chiang Mai, 50290, Thailand Author Sittichaya, Wisut https://orcid.org/0000-0001-6200-1285 Institute for Problems of Ecology and Evolution, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia wisut.s@psu.ac.th text ZooKeys 2022 2022-08-16 1118 1 19 http://dx.doi.org/10.3897/zookeys.1118.89593 journal article http://dx.doi.org/10.3897/zookeys.1118.89593 1313-2970-1118-1 B1B42B9E1CCA4E85A22E39710CFA755E BAC22F9CBE275EE788FFC573D610E645 Malayorthomorpha siveci Mrsic , 1996 Fig. 1 Malayorthomorpha siveci Mrsic , 1996: 139 (D). Malayorthomorpha siveci - Shelley et al. 2000 : 111 (L). Remark. This species was described from Park Belum, 5°30'7"N , 101°26'21"E , ca. 320-350 m a.s.l., Hulu (Sungani), Perak, Malaysia ( Mrsic 1996 ). Only two male specimens have been obtained, and both have been discovered in a small area. This species is considered endemic to northern Malaysia. Figure 1. Malayorthomorpha siveci Mrsic , 1996, ♂ holotype A, B anterior part of body, lateral and dorsal views, respectively C anal segment, ventral view D sternal process and left anterior leg of body segment 5, suboral view E-G right gonopod, mesal, lateral and suboral views, respectively. Photos not to scale (after Mrsic 1996 ).