Kootenayscolex
Kootenayscolex is the extinct genus of annelid resembling a bristle worm, found in Burgess Shale, British Columbia. It appears to have been an aquatic worm with about 56 chaetae on each of up to 25 segments, serving to propel it through mud or water.
The only one known species in the genus, Kootenayscolex barbarensis, is thought to exhibit primitive traits that show the foundation for the evolution of modern annelids, like "head" segment that still has traits of simply being another generic body segment, for example having bristles poking out of it, which no modern annelid shares.