Mackinnonia

Mackinnonia Temporal range: Late Early Cambrian^[1] PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
(unranked):	incertae sedis
Class:	†Helcionelloida
Order:	†Helcionelliformes
Family:	†Helcionellidae
Genus:	†Mackinnonia Runnegar 1980
Species
M. taconica (Landing & Bartovski 1996) Skovsted & Peel 2007 M. rostratum Zhou & Xiao 1984 (type)

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]

References

1 2 3 4 Christian B. Skovsted; John S. Peel (2007). "Small shelly fossils from the argillaceous facies of the Lower Cambrian Forteau Formation of western Newfoundland". Acta Palaeontologica Polonica. 52 (4): 729–748.

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