title: Trimerodytes percarinatus
text: # Trimerodytes percarinatus
  
  Trimerodytes percarinatus, commonly known as the eastern water snake, olive keelback, olive annulate keelback or Chinese keelback water snake, is a species of snake in the subfamily Natricinae.
  
  ## Taxonomy
  
  The type locality for T. percarinatus is Guadun (formerly spelled as Kuatun), Wuyishan City (former Chongan County) in NW Fujian, China.
  
  ## Subspecies
  
  The subspecies Trimerodytes percarinatus suriki is endemic to Taiwan where it occurs in the whole country.
  
  ## Description
  
  T. percarinatus is a defensive snake that bites readily when caught, but it is not venomous. It is a medium-sized snake, typically attaining a total length (including tail) of 70–90 cm (28–35 in), but may grow up to 110 cm (43 in). An adult female usually lays 4 to 13 eggs, but may lay as many as 25 eggs.
  
  ## Distribution and habitat
  
  T. percarinatus is found in NE India (Changlang District, Arunachal Pradesh), Myanmar (= Burma), Thailand, Laos, Vietnam, S China (Hainan, Zhejiang, Jiangxi, Fujian, Guangdong, Guangxi, Guizhou, Sichuan, Hubei), Hong Kong, and Taiwan. It is an aquatic species associated with hilly areas.
  
  ## Diet
  
  T. percarinatus preys on shrimps, frogs (including tadpoles), and fish.
  
  