This is an extinct marine reptile with sensational mouth apparatus. The article about it is here: http://www.sci-news.com/paleontology/science-atopodentatus-unicus-new-fossil-reptile-china-01768.html
This image represents three hypothetical styles of feedeng . On the forefront it combs the ground with lower jaw. The middle reptile hollows out some Crustacea from the ground with the groove on the upper jaw and flexible skin fold on it. And the farthest animal just tries to catch some small fish and filtrate it with it’s jaw apparatus.