Olive Keelback
There are three species of snake named olive keelback: * ''Atretium schistosum'', olive keelback wart snake * '' Trimerodytes percarinatus'', species in the subfamily Natricinae * ''Helicops modestus ''Helicops modestus'', the olive keelback, is a species of snake in the family Colubridae. It is endemic to Brazil, and can be found in the states of São Paulo, Rio de Janeiro, Minas Gerais, Mato Grosso do Sul, Goiás, and the Federal District o ...

Atretium
''Atretium schistosum'', also known commonly as the split keelback and the olive keelback wart snake, is a species of snake in the subfamily Natricinae of the family Colubridae. The species, which is the sole species in the genus ''Atretium'', is native to South Asia. It is a common and harmless watersnake. Geographic range ''A. schistosum'' is found in Sri Lanka, India, Bangladesh and Nepal. In India it occurs in peninsular India south of latitude 15 degrees north and along the east coast to Uttarakhand. It is reported to be very common around Bangalore, North Arcot district (Tamil Nadu) and Kakinada area in Andhra Pradesh. Occurs up to 1000 m (3280 ft) above sea level. Absent from most of North India. Description ''A. schistosum'' is a small, robust snake with thin head, short snout and slit nostrils placed rather high. The snake is olive-green and yellow to orange below. It is sometimes tinged with pink or purplish on the flanks. The length of the tail is one th ...
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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 Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ... 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 , but may grow up to . An adult female usually lays 4 to 13 eggs, but may la ...
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