Ediacara biota
Like many of the Ediacara biota, the relationship of "Spriggina" to other groups is unclear. It bears some similarity to the living polychaete worm "Tomopteris" and Amphinomidae, but its lack of chaetae, along with other lines of evidence, suggests that it cannot be placed in this phylum. It was also compared to the rangeomorphs, frondose members of the Ediacara biota that may represent a separate kingdom.