A typical sea snake, Hydrophis belcheri. Note the flattened tail as an adaptation to swimming in the open sea.
<a href="//doi.org/10.1371/journal.pone.0027373.g005" class="extiw" title="doi:10.1371/journal.pone.0027373.g005">doi:10.1371/journal.pone.0027373.g005</a>
Rasmussen AR, Murphy JC, Ompi M, Gibbons JW, Uetz P (2011)
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Rasmussen AR, Murphy JC, Ompi M, Gibbons JW, Uetz P (2011) Marine Reptiles. PLoS ONE 6(11): e27373. <a href="//doi.org/10.1371/journal.pone.0027373" class="extiw" title="doi:10.1371/journal.pone.0027373">doi:10.1371/journal.pone.0027373</a>