''Laumonttoceras'' is a genus in oncocerid family

Jovellaniidae Jovellaniidae was established as a family within the Oncocerida to include genera characterized by longiconic orthocones and cyrtocones with a subtriangular to depressed cross-section in which the ventral (siphuncular) side is typically angular o ...

from the lower

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 ...

of Europe characterized by uncompressed, moderately expanding, orthocones with a central siphuncle composed of cylindrical segments that are slightly contracted at the septal openings and which contain discrete, discontinuous actinosphonate deposits. ''Laumontoceras'' differs from ''

Jovellania ''Jovellania'' is a genus of extinct prehistoric nautiloids from the order Oncocerida known from the Lower Devonian of Europe (France, Germany).Sweet, W. C. (1964). "Nautiloidea -Oncocerida". '' Treatise on Invertebrate Paleontology''. Part K Nau ...

'', also from the lower Devonian of Europe, primarily in having a central rather than a subventral siphuncle, as in ''Jovellania''.

References

*Sweet, W. C. 1964. Nautiloidea- Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ of Kansas Press. Teichert & Moore, (eds) {{Taxonbar, from=Q6498307 Prehistoric nautiloid genera Oncocerida