''Burenoceras'' is a genus of small, even tiny, Gasconadian cyrtoconic ellesmeroceratids in which the phragmocone—the chambered portion—is shorter that the living chamber. In general form, ''Burenoceras'' is similar to ''

Levisoceras ''Levisoceras'' is a genus of early Ordovician ellesmerocerid cephalopod A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively ...

'', but much smaller. Two species, ''B. phragmoceroides'' and ''B. percompressum'' with contracted, slit-like apertures, are miniature forms resembling the much larger homeomorphic

Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...

discosorid ''Phragmoceras'' and

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

oncocerid The Oncocerida comprise a diverse group of generally small nautiloid cephalopods known from the Middle Ordovician to the Mississippian (early Carboniferous; one possible member is known from the Early Permian), in which the connecting rings are ...

''Bolloceras''. Other ''Burenoceras'' have apertures that are variable straight sided or flaring. ''Burenoceras'' is among what are referred to as microellesmeroceroids.

References

* Flower, R.H. 1964. The Nautiloid Order Ellesmerocerida (Cephalopoda); Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro N.M. * W. M. Furnish & Brian F. Glenister, 1964. Nautiloidia – Ellesmerocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America, Teichert and Moore (eds). Prehistoric nautiloid genera Ordovician cephalopods of Asia Ordovician cephalopods of North America Ellesmerocerida {{paleo-Nautiloidea-stub