Mesonacis

Mesonacis Temporal range: 540–488 Ma PreЄ Є O S D C P T J K Pg N Cambrian

Mesonacis vermontanus, Cambrian, Australia, Courtesy of Sam Gon III.
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Family:	Olenellidae
Genus:	Mesonacis
Species
M. vermontanus

Mesonacis is an extinct genus of trilobite that lived during the Cambrian, found in Wales and Australia.

References

Hagadorn, J.W. (2002). "Burgess Shale-type Localities: The global picture". In Bottjer, D.J., W. Etter, J.W. Hagadorn & C.M. Tang, eds. Exceptional Fossil Preservation -- A Unique View on the Evolution of Marine Life. Columbia University Press. ISBN 0231102542.
Greg Edgecombe and the Australian Museum. "Australian Trilobites: A Species List and Bibliography". http://www.austmus.gov.au/palaeontology/research/trilobites03.htm?. Retrieved August 23, 2005.
Sam Gon III. "A guide to the Orders of Trilobites". http://www.trilobites.info/index.htm. Retrieved August 23, 2005.
Nedin, C. (1995). "The Emu Bay Shale, a Lower Cambrian fossil Lagerstätte, Kangaroo Island, South Australia". Memoirs of the Association of Australasian Palaeontologists 18: 31–40.
Simpson, Dave. "Trilobites of South Australia". http://info.esc.net.au/~dasimpson/index.htm. Retrieved August 23, 2005.