Tichkaella

Tichkaella
Temporal range: Mid Cambrian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
(unranked): incertae sedis
Class: †Helcionelloida
Order: †Helcionelliformes
Superfamily: †Helcionelloidea
Genus: †Tichkaella

Tichkaella is a genus of helcionellid from the Middle Cambrian. It has a strongly spiralled, smooth shell with concentric ridges that have low relief. Other than its looser coiling, it is very similar to Protowenella.[1]

References

  1. ^ Peel, JS (1991). "Functional morphology of the Class Helcionelloida nov., and the early evolution of the Mollusca". In Simonetta, AM; Conway Morris, S. The early evolution of Metazoa and the significance of problematic taxa. Cambridge University Press. pp. 157–177. ISBN 978-0-521-40242-2.