| Octamerella Temporal range: M Silurian | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | † Oncocerida |
| Family: | † Hemiphragmoceratidae |
| Genus: | † Octamerella Teichert and Sweet (1962) |
Octamerella is an extinct genus of prehistoric nautiloids from the oncocerid family Hemiphragmoceratidae that lived in what is now Europe and North America during the Middle Silurian.
Octamerella has a breviconic shell and a mature aperture that is contracted so as to have four pairs of dorsolateral sinuses, four on each side, and a narrow mid-dorsal salient. The two ventral-most sinus pairs are typically the largest, while the dorsal-most pair is short and wide, forming a circular opening. [1]
