|[Syn. :Norwoodia bellaspina (Shanan Peters dissertation, 2003, unpubl.)]|
Here we have a nice spiny trilobite rarety of the species Norwoodia boninoi from the Weeks formation. The species Norwoodia boninoi is one of the great rarities of the Weeks formation. This specimen offers a outstantig preservation and a nice colour as well. Both genal spines and long back spine are very nice preserved.
The species Norwoodia boninoi was just recently described by Robison & Babcock in 2011. This trilobite was described back in 2003 by Shanan Peters along with servile other Weeks Formation trilobite taxa. However his 2003 dissertation got never officially published. But it got quite widely known and it was as a PDF on the internet pages of the Department of Geoscience of the Wisconsis-Madison University. So it was also citied by later publications.
It is hard to tell if the new taxa Norwoodia boninoi or the older taxa Norwoodia bellaspina is the valid. There is no clarification about the status of the Peters publication in Robison & Babcock 2011. But is absolutely clear that both taxa are describing the same trilobite species becourse Peters 2003 and Robison & Babcock 2011 are using one and the same fossil in the Smithsonian Museum under the number USNM 437971 as holotype.
So it is might be possible that Norwoodia bellaspina falls under the ICZN rules like „nomen protectum“ or „nomen conservandum“ but in the other hand Shanan Peters dissertation seems to be never formally published.
In this article description is Norwoodia boninoi used because it is the youngest published taxa for this trilobite.
|Millard Co., Utah, USA|
|Size trilobite:||about 8 mm long|
|Age:||Upper Cambrian, Weeks Fm., (about. 518 Mill. y.o.)|