A new species of karst-associated kukri snake (Reptilia: Squamata: Colubridae: Oligodon Fitzinger, 1826) from southern Thailand

Sampled localities of the Oligodon cinereus species complex used in this study, including Oligodon speleoserpens sp. nov., O. huahin, O. phangan, O. promsombuti, O. purpurascens, O. saiyok, O. joynsoni, O. inornatus, O. nagao, O. cinereus s. str., and unnamed lineages of O. “cinereus” labeled by clade. Base map created using simplemappr.net. Filled icons denote populations included in phylogenetic analyses; empty icons denote populations not included in the phylogenetic analyses; type localities are indicated by a dot at the center of an icon. Colors and locality numbers correspond to Figure 2 and Table S1. Localities. Oligodon speleoserpens sp. nov.: (1) Tham Khao Ting Cave, Trang Prov., and Tham Le Stegodon Cave, Satun Prov., Thailand; Oligodon sp.: (2) Krabi Prov., Thailand (unconfirmed locality); O. saiyok: (3) Sai Yok Distr., Kanchanaburi Prov., Thailand; O. cinereus clade 4: (4) Rakhine Yoma Mts., Rakhine St., Myanmar; O. cinereus clade 1 (sensu stricto): (5) Cat Tien NP., Dong Nai Prov., Vietnam (type locality of O. cattienensis); (6) Bu Gia Map NP, Binh Phuoc Prov., Vietnam; (7) Kirirom NP, Kampong Speu Prov., Cambodia; O. cinereus clade 2: (8) Kalaw, Shan St., Myanmar; (9) Alaungdaw Kathapa NP, Sagaing Div., Myanmar; (10) Chi Linh, Hai Duong Prov., Vietnam; (11) Tam Dao NP, Vinh Phuc Prov., Vietnam; (12) Pu Mat NP, Nghe An Prov., Vietnam; O. phangan: (13) Mingalardon, Hlawga WP, Yangon Div., Myanmar; (14) Ko Phi Phi Don Isl., Krabi Prov., Thailand; (15) Ko Pha Ngan Isl., Surat Thani Prov., Thailand; O. huahin: (16) Kaeng Krachan NP, Phetchaburi, Thailand; (17) Suan Phueng, Ratchaburi, Thailand; O. nagao and O. cinereus clade 3: (18) Hainan Isl., Hainan Prov., China; (19) Nonggang NR, Guangxi Prov., China; (20) Huu Lien, Lang Son Prov., Vietnam (type locality of O. nagao); O. joynsoni: (21) Ngao Dist., Lampang Prov., Thailand (type locality); (22) Doi Tung, Chiang Rai Prov., Thailand; (23) Xishuanhbanna NP, Yunnan Prov., China; O. promsombuti: (24) Khao Phanom Wang, Surat Thani Prov., Thailand; O. inornatus: (25) Nong Kai Ploi, Chonburi Prov., Thailand (type locality); (26) Samkos WS, Pursat Prov., Cambodia.