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Atopodentatus
Atopodentatus ("strange toothed") is an aquatic reptile from the Middle Triassic. It has a shocking appearance because of his mouth. It was originally believed to have a mouth that went straight up its head, but recent fossils have revealed that the mouth actually went horizontally, like a vacuum cleaner. It is believed to have fed by sucking vegetation from the sea floor, just like Henodus.

References

http://www.sci-news.com/paleontology/atopodentatus-unicus-earliest-herbivorous-marine-reptile-03848.html