Muraenosaurus sp.

Muraenosaurus ("brunette reptile") is an extinct genus of cryptoclidid plesiosauroid that lived in the Middle Jurassic, in what is now Europe. Its fossils have been found in England and France. Remains probably belonging to this genus have also been found in Argentina and Chile.
https://www.biobiochile.cl/noticias/ciencia-y-tecnologia/ciencia/2020/08/18/descubren-dos-generos-de-plesiosaurios-que-habitaron-el-norte-de-chile-hace-160-millones-de-anos.shtml