Tannuella

Tannuella; Temporal range: Early Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	†Helcionelloida
Order:	†Helcionelliformes
Family:	†Helcionellidae
Genus:	†Tannuella

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,[1] but are more broadly assigned to the helconellids (or putatively the tergomyans); i.e. "Cambrian monoplacophora".[2]

References

Kröger, B. R.; Vinther, J.; Fuchs, D. (2011). "Cephalopod origin and evolution: A congruent picture emerging from fossils, development and molecules". BioEssays. 33 (8): 602–613. doi:10.1002/bies.201100001. PMID 21681989.
Brock, G. A. (2004). "A New species of Tannuella (Helcionellida, Mollusca) from the Early Cambrian of South Australia". Association of Australasian Palaeontologists Memoirs. 30: 133–143. hdl:1959.14/41429. ISSN 0810-8889.

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[Kröger2011-1] Kröger, B. R.; Vinther, J.; Fuchs, D. (2011). "Cephalopod origin and evolution: A congruent picture emerging from fossils, development and molecules". BioEssays. 33 (8): 602–613. doi:10.1002/bies.201100001. PMID 21681989.

[2] Brock, G. A. (2004). "A New species of Tannuella (Helcionellida, Mollusca) from the Early Cambrian of South Australia". Association of Australasian Palaeontologists Memoirs. 30: 133–143. hdl:1959.14/41429. ISSN 0810-8889.