Longiproetus cf. tenuimargo

                              Somnium

                              Longiproetus cf. tenuimargo

                         Middle Devonian, Eifelian, Jemelle Formation (upper part)

New data on Astycoryphe, Dohmiella, Longiproetus and Quadratoproetus (Trilobita, Proetidae) from the Middle Devonian in the Ardennes, Belgium

N. Jb. Geol. Paláont. Abh. 264/1, 77-87 Stuttgart, April 2012