''Aletoceras'' is a genus of

Oncocerida 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 t ...

nautiloid Nautiloids are a group of marine cephalopods ( Mollusca) which originated in the Late Cambrian and are represented today by the living ''Nautilus'' and ''Allonautilus''. Fossil nautiloids are diverse and speciose, with over 2,500 recorded species ...

s from the middle Devonian of North America included in the family Brevicoceratidae. The shell is a depressed brevicone, that is to say short. Sutures are generally straight, the siphuncle ventral, empty. The peristome (aperture rim) has a broad hyponomic sinus -for the hydrojet funnel, ventrolateral projections, dorsolateral sinuses - possibly for the eyes, and probably a mid dorsal sinus. In general form, ''Aletoceras'' resembles '' Brevicoceras'' and '' Eleusoceras'', both also from the middle Devonian of North America. The orientation of ''Aletoceras'' and others like it may have been vertical with the aperture facing down .

References

* W.C. Sweet 1964. Nautiloidea - Oncocerida,

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 ...

, Part C. University of Kansas Press, Lawrence, Ka.
''Aletoceras''
in Fossilworks, 1/5/15 Prehistoric nautiloid genera {{paleo-nautiloidea-stub