A new species of the aquatic natricine colubrid snake genus Opisthotropis is described based on a single specimen from Nong Khai Province, northeastern Thailand. The new species is distinguished from other Opisthotropis by the combination of having smooth scales on the body and tail, 15 dorsal scale rows throughout the body, the fourth supralabial in contact with the eye, the posterior pair of chin shields longer than the anterior pair, and a glossy black dorsum with yellow spots.
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