Thai National Parks

Snakes of Thailand

Species of Thailand

Copperhead racer

In Thai: งูทางมะพร้าว, ngu taang mapao

Binomial name: Coelognathus radiatus, Heinrich Boie, 1827

The radiated ratsnake, copperhead rat snake or copper-headed trinket snake (Coelognathus radiatus) is a nonvenomous species of colubrid snake.


These snakes are generally very defensive. They are very confident in their ability to defend themselves so you must be very confident in order to remotely have a chance at controlling this species. They are also a good trainer snakes for those looking to get into cobras and other elapids.


  • Indonesia (Sumatra, Bangka, Borneo/Kalimantan, Java),
  • Malaysia and Brunei (Malaya and East Malaysia); Borneo,
  • Singapore Island,
  • Burma (Myanmar),
  • Thailand (including Phuket),
  • Laos, Cambodia, Vietnam,
  • India (Assam, Arunachal Pradesh (Miao - Changlang district, Chessa, Chimpu, Itanagar - Papum Pare district) Captain, pers. comm.),
  • Bangladesh, Nepal,
  • South China (Fujian, Yunnan, Guangxi, Guangdong, Hong Kong),
  • Nepal

Type locality: Java

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Scientific classification

Coelognathus radiatus

Common names

  • German: Strahlennatter
  • English:
    • Copperhead racer
    • Copperhead rat snake
    • Radiated rat snake
    • Copper-headed trinket snake
  • Thai: งูทางมะพร้าว, ngu taang mapao


  • Coelognathus radiatus, Van Stanley Bartholomew Wallach et al. (2014)
  • Elaphe radiatus, T.S.N. Murthy (2010)
  • Coelognathus radiata, Thomas Ziegler et al. (2007)
  • Coelognathus radiatus, Winchell (2003)
  • Elaphe radiata, Olivier S.G. Pauwels et al. (2003)
  • Coelognathus radiatus, Andreas Gumprecht (2003)
  • Elaphe radiata, Thomas Ziegler (2002)
  • Coelognathus radiatus, Urs Utiger et al. (2002)
  • Coelognathus radiatus, Andreas Gumprecht (2000)
  • Elaphe radiata, Tanya Chan-Ard et al. (1999)
  • Elaphe radiata, James Draper Lazell et al. (1999)
  • Elaphe radiata, Merel J. Cox et al. (1998)
  • Elaphe radiata, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Elaphe radiata, Klaus-Dieter Schulz (1996)
  • Elaphe radiata, Malcolm Arthur Smith (1943)
  • Coelognathus radiatus, Doris Mable Cochran (1930)
  • Elaphe radiata, Clifford H. Pope (1929)
  • Elaphe radiata, Thomas Barbour (1912)
  • Coluber radiatus, Frank Wall (1908)
  • Coluber (Compsosoma) radiatus, Salomon Müller (1895)
  • Coluber radiatus, George Albert Boulenger (1894)
  • Compsosoma radiatum, Ferdinand Stoliczka (1870)
  • Elaphis radiatus, JAN (Multiple authors) (1863)
  • Spilotes radiatus, Albert Charles Lewis Günther (1858)
  • Elaphis (Compsosoma) radiatum, Pieter Bleeker (1857)
  • Compsosoma radiatum, André Marie Constant Duméril & Gabriel Bibron (1854)
  • Plagiodon radiata, André Marie Constant Duméril (1853)
  • Elaphis radiatus, André Marie Constant Duméril (1853)
  • Coelognathus radiata, Leopold Fitzinger (1843)
  • Tropidonotus quinque, Theodore Edward Cantor (1839)
  • Coluber quadrifasciatus, Theodore Edward Cantor (1839)
  • Coluber radiatus, Hermann Schlegel (1837)
  • Coluber radiatus, Friedrich Boie (1827)

Free photo downloads

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  • Coelognathus radiatus


Coelognathus radiatus
Coelognathus radiatus
Coelognathus radiatus

Range Map

Distribution map of Copperhead racer, Coelognathus radiatus in Thailand
  • Ao Luek District, Krabi
  • Ban Bueng District, Chonburi
  • Ban Lat District, Phetchaburi
  • Bang Lamung District, Chonburi
  • Bang Saphan District, Prachuap Khiri Khan
  • Bangkok Province
  • Cha-Am District, Phetchaburi
  • Chiang Dao District, Chiang Mai
  • Chok Chai District, Nakhon Ratchasima
  • Chom Bueng District, Ratchaburi
  • Chom Thong District, Chiang Mai
  • Dan Sai District, Loei
  • Det Udom District, Ubon Ratchathani
  • Doem Bang Nang Buat District, Suphan Buri
  • Doi Inthanon National Park
  • Doi Khun Tan National Park
  • Doi Phu Kha National Park
  • Doi Saket District, Chiang Mai
  • Doi Suthep - Pui National Park
  • Hang Chat District, Lampang
  • Hang Dong District, Chiang Mai
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Kha Khaeng Wildlife Sanctuary
  • Huai Khot District, Uthai Thani
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Khao Lak - Lam Ru National Park
  • Khao Phra Thaeo Wildlife Sanctuary
  • Khao Sam Roi Yot National Park
  • Khao Sok National Park
  • Khao Yai National Park
  • Khao Yoi District, Phetchaburi
  • Khlong Luang District, Pathum Thani
  • Khlong Thom District, Krabi
  • Khun Yuam District, Mae Hong Son
  • Ko Chang District, Trat
  • Ko Lanta District, Krabi
  • Ko Samui District, Surat Thani
  • Lahan Sai District, Buriram
  • Mae Ai District, Chiang Mai
  • Mae Rim District, Chiang Mai
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Chiang Rai District, Chiang Rai
  • Mueang Chonburi District, Chonburi
  • Mueang Kalasin District, Kalasin
  • Mueang Kanchanaburi District, Kanchanaburi
  • Mueang Krabi District, Krabi
  • Mueang Loei District, Loei
  • Mueang Mukdahan District, Mukdahan
  • Mueang Nakhon Ratchasima District, Nakhon Ratchasima
  • Mueang Nakhon Sawan District, Nakhon Sawan
  • Mueang Nong Khai District, Nong Khai
  • Mueang Nongbua Lamphu District, Nong Bua Lamphu
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Phichit District, Phichit
  • Mueang Ratchaburi District, Ratchaburi
  • Mueang Sa Kaeo District, Sa Kaeo
  • Mueang Samut Sakhon District, Samut Sakhon
  • Mueang Udon Thani District, Udon Thani
  • Na Haeo District, Loei
  • Na Klang District, Nong Bua Lamphu
  • Nam Nao National Park
  • Nikhom Phatthana District, Rayong
  • Noen Maprang District, Phitsanulok
  • Nong Han District, Udon Thani
  • Nong Phai District, Phetchabun
  • Omkoi District, Chiang Mai
  • Pang Sida National Park
  • Phimai District, Nakhon Ratchasima
  • Phu Luang Wildlife Sanctuary
  • Phuket Province
  • Pua District, Nan
  • Sai Yok District, Kanchanaburi
  • Sam Roi Yot District, Prachuap Khiri Khan
  • San Sai District, Chiang Mai
  • Saraphi District, Chiang Mai
  • Sawang Daen Din District, Sakon Nakhon
  • Takua Pa District, Phang Nga
  • Tat Mok National Park
  • Tha Li District, Loei
  • Tha Takiap District, Chachoengsao
  • Tha Yang District, Phetchaburi
  • Thalang District, Phuket
  • Thoeng District, Chiang Rai
  • Umphang District, Tak
  • Wichian Buri District, Phetchabun
Range map of Coelognathus radiatus in Thailand