''Truyolsoceras'' is an Upper Devonian ammonite (subclass

Ammonoidea Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttle ...

) included in the goniatitid subfamily

Aulatornoceratinae Aulatornoceratinae is one of three subfamilies of the goniatitid family Tornoceratidae, an extinct order of Paleozoic ammonoid cephalopods. ''Aulotornoceratinae'' was established as a subfamily by R.T.Becker, 1993, initially for '' Aulatornocera ...

. The shell is involute, lenticular, with a narrow umbilicus and moderately high aperture. The adventitious lobe of the suture, which lies between the ventral and lateral lobes, is rounded.

References

*''Truyolsoceras'' i
GONIAT
6/10/12
The Paleobiology Database ''Truyolsoceras'' entry
accessed 10 June 2012 Goniatitida genera Tornoceratidae Ammonites of North America Late Devonian ammonites {{Goniatitida-stub