Kingdom Animalia Class †Helcionelloida Family †Helcionellidae | Phylum Mollusca Order †Helcionelliformes Rank Genus | |
Similar Plectronoceras, Monoplacophora, Nautilida, Nautiloid | ||
Tannuella is a genus of helcionellids known from Lower Cambrian strata.
It has a high, septate shell similar to that of hypseloconids such as Knightoconus . These genera were once considered ancestral cephalopods, but are more broadly assigned to the helconellids (or putatively the tergomyans); i.e. "Cambrian monoplacophora".
References
Tannuella Wikipedia(Text) CC BY-SA