Naraoidia
Naraoidia are soft shelled
trilobites that are known only from the Early and Middle
Cambrian -- primarily from the
Burgess Shale of
British Columbia and the
Maotianshan Shale of
China. There is a single genus --
Naraoia naraoia is considered to be a trilobite but has two peculiar features. The body covering is entirely unmineralized, and there is no thorax. Maximum size is about 4cm. A second softbodied trilobite --
Tegopelte -- is known from the same formations, but it may be only distantly related to
Naraoia.