Mackinnonia
Extinct genus of molluscs
From Wikipedia, the free encyclopedia
Mackinnonia is a genus of small shelly fossil comprising straight or slightly coiled shells of the helcionelloid type.[1] The outer surface of their shell is smooth, whereas the inner surface has a net-like ridges.[1] They are known from late Early Cambrian rocks across North America and Greenland.[1]
| Mackinnonia Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | †Helcionelloida |
| Order: | †Helcionelliformes |
| Family: | †Helcionellidae |
| Genus: | †Mackinnonia Runnegar 1980 |
| Species | |
| |
