Sirius Passet is a special fossil site, a Cambrian lagerstätte in Greenland. It is from six places on the eastern shore of a fjord in the far north of Greenland.[1] It was discovered in 1984. About 10,000 fossil specimens have been collected so far.
The fauna is just before that of the Burgess Shale, probably ten to fifteen million years older – 518 vs. 505 mya.[2] There were no vertebrates at that time: all the animals were invertebrates.
The fauna includes some arthropods and sponges, and rare representatives of other groups. A polychaete annelid from the Sirius Passet was described in 2008.[3] 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.
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