Proterochersis
Reptiles
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![Shell variability in the stem turtles Proterochersis spp. [PeerJ]](/imgres?imgurl=https://dfzljdn9uc3pi.cloudfront.net/2018/6134/1/fig-6-2x.jpg&imgrefurl=https://peerj.com/articles/6134/&h=949&w=1200&tbnid=qdOfnY37cy_JmM&q=Proterochersis&tbnh=119&tbnw=150&usg=AI4_-kQTnAObtsC-viwZ2uT1Xo_MhMIBzg&vet=1&docid=YFnINdpeGONr0M&sa=X&ved=2ahUKEwjRlf6Cx_qFAxXwkYkEHfvsDvEQ9QF6BAgAEAo)
Proterochersis is an extinct genus of turtle from the Late Triassic period of Europe. It is known from a large number of fossils uncovered in Germany and Poland. The genus was named from fossil remains from Germany in 1913 by Fraas, who recognized... Wikipedia