Naraoidia

Soft shelled trilobites that are known only from the 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.