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History
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 The true sea snakes (previously Hydrophiidae) comprise approximately 55 species of highly aquatic marine snakes that occur from South Africa east to Panama. They are related to elapid snakes (coral snakes, cobras, kraits, etc.). True sea snakes include both species that have tiny belly scales and species that have broad belly scales with a central keel. The relationships among the true sea snakes have been studied by Harold Voris (1977), and the relationships of sea snakes to other elapid snakes have been studied most recently by J. Scott Keogh (1997).
 
General Reference: Heatwole, H. 1999. Sea Snakes. University of New South Wales Press, Sydney.
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