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 moderately curved, gently expanding bassleroceratid (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
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