Protowenella
| Protowenella Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Class: | †Hyolitha |
| Order: | †Orthothecida |
| Genus: | †Protowenella |
Protowenella is a genus of hyolith from the Middle Cambrian of Australia and Greenland, previously thought to be a helcionelloid.[1] It has a strongly spiralled, smooth shell with concentric ridges that have low relief. Other than its tighter coiling, it closely resembles Tichkaella.[2]
References
[edit]- ↑ Peel, John S. (2 October 2021). "In-place operculum demonstrates that the Middle Cambrian Protowenella is a hyolith and not a mollusc". Alcheringa: An Australasian Journal of Palaeontology. 45 (4): 385–394. doi:10.1080/03115518.2021.2004225.
- ↑ Peel, J. S. (1991). "Functional Morphology of the Class Helcionelloida Nov., and the Early Evolution of the Mollusca". In Simonetta, A. M.; Conway Morris, S (eds.). The Early Evolution of Metazoa and the Significance of Problematic Taxa. Cambridge University Press. pp. 157–177. ISBN 978-0-521-40242-2.
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