Monomorphichnus

Monomorphichnus; Temporal range: 542.0-466.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	†Artiopoda
Class:	†Trilobita (?)
Ichnogenus:	†Monomorphichnus; Crimes 1970

Monomorphichnus is an arthropod trace fossil known from the base of the Cambrian period onwards, before the first trilobite fossils.^[2]

References

^ D. Fillion and R. K. Pickerill. 1990. Ichnology of the Upper Cambrian? to Lower Ordovician Bell Island and Wabana groups of eastern Newfoundland, Canada. Palaeontographica Canadiana 7:1-119
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