''Polonoceras'' is a genus 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 ...

named by Dybczynski, 1913. The type species is ''Polonoceras planum'' Dybczynski. According to Miller, et al. in the American

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

, 1957, ''Polonoceras'' is a subgenus of ''

Tornoceras ''Tornoceras'' is a strongly involute, subdiscoidal Middle and Upper Devonian goniatite with a suture that forms six to ten lobes. '' Aulatornoceras'', '' Protornoceras'', '' Epitornoceras'', '' Lobotornoceras'' are among related genera inclu ...

''. ''Polonoceras'', which lived during the Late Devonian, has an involute or moderately evolute, discoidal shell with a high aperture and flattened, grooved venter. The adventitious lobe, next to the ventral lobe, is widely rounded, the Ventro-lateral saddle narrow and sometimes higher than lateral saddle. ''Polonoceras'' is found in Europe, in Poland, where it was discovered. It is also reported from Upper Devonian (middle Famennian) in Canning Basin, Western Australia.

References

*''Polonoceras'' i
GONIAT Online
6/10/12
The Paleobiology Database ''Polonoceras'' entry
accessed 10 June 2012 * Late Devonian ammonites Goniatitida genera Tornoceratidae Ammonites of Australia Famennian life Famennian genus first appearances Famennian genus extinctions {{Goniatitida-stub