Lawrenceoceras

Lawrenceoceras Temporal range: Early Ordovician
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Ellesmerocerida
Family:	Bassleroceratidae
Genus:	Lawrenceoceras Ulrich et al., 1944

Lawrenceoceras is a genus of moderately curved, gently expanding bassleroceratids (Nautiloidia, Ellesmerocerida) from the Lower Ordovician of eastern North America. Septa dividing the chambers are close spaced; sutures straight, transverse; the siphuncle narrow, submarginal.

Lawrenceoceras is closely related to nautiloids such as Bassleroceras that gave rise to the Tarphycerida although it specifically may not be ancestral.

References

• W.M.Furnish & Brian F. Glenister, 1964. Nautiloidea - Ellesmerocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America.
• Lawrenceoceras in Fossilworks Archived 2022-03-25 at the Wayback Machine