An assemblage of bradoriid arthropods from the Mernmerna Formation in the Donkey Bore
Syncline, central Flinders Ranges, South Australia contains eleven species, including three species
of the enigmatic ornamented spine Mongolitubulus. Four new taxa are described, Onagrocharion
tuberosus gen. et sp. nov., Amphikeropsis myklosis gen. et sp. nov., Hipponicharion australis sp.
nov. and Mongolitubulus unispinosa sp. nov. The presence of Hipponicharion australis sp. nov.
in the upper Mernmerna Formation represents the first occurence of the genus in Australia and
extends the biogeographic range of Hipponicharion to eastern Gondwana. Bradoriid specimens
of Mongolitubulus unispinosa sp. nov. exhibiting a single mature ornamented spine attached
to the central portion of the carapace provides definitive evidence of a bradoriid affinity for the
enigmatic, widespread Mongolitubulus small shelly fossil taxon. The assemblage includes several
species that facilitate correlation with the Stansbury Basin of South Australia, but also with faunas
from other Cambrian palaeocontinents, including Antarctica and Laurentia.
2007. Vol. 33, 67-100 p.