Lawrenceoceras Temporal range: Early Ordovician
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Genus: | Lawrenceoceras Ulrich et al., 1944
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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.