Sirius Passet
The fauna includes some arthropods and sponges, and rare representatives of other groups. A polychaete annelid from the Sirius Passet was described in 2008. Polychaete annelids are a significant part of the Burgess Shale fauna, but are otherwise unknown from the other early Cambrian lagerstätten. This single species from a single place improves our knowledge of this group.