What is "truyolsoceras"

Truyolsoceras is an Upper Devonian ammonite (subclass Ammonoidea) included in the goniatitid subfamily Aulatornoceratinae. The shell is involute, lenticular, with a narrow umbilicus and moderately high aperture. The adventitious lobe of the suture, which lies between the vental and lateral lobes, is rounded.