Umbetoceras is a genus belonging to the goniatitid superfamily Gastriocerataceae

Gastriocerataceae

Gastriocerataceae is one of seventeen superfamilies of the Goniatitina suborder. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.-References:...

 and family Homoceratidae

Homoceratidae

Homoceratidae is one of five families of the Gastriocerataceae superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.-References:...

 from the Carboniferous

Carboniferous

The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...

 of the Russian Federation and Uzbekistan

Uzbekistan

Uzbekistan , officially the Republic of Uzbekistan is a doubly landlocked country in Central Asia and one of the six independent Turkic states. It shares borders with Kazakhstan to the west and to the north, Kyrgyzstan and Tajikistan to the east, and Afghanistan and Turkmenistan to the south....

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The shell of Umbetoceras is involute in the adult, with an evolute early stage and moderately wide umbilucus. Sculpture consists of strong riblets on intermediate stages with tubercles present on umbilical shoulder. The suture has a wide double pronged ventral lobe with a median saddle that exceeds two thirds its height.

~References~

• Paleobiology Database- Umbetoceras 8/21/10
• GONIAT-on line see Umbetoceras 8/21/10