Sprigginidae

thumb|227x227px|Large landscape model of Spriggina floundersi, located in Arkaroola|Arkaroola Wilderness Sanctuary Spriggina is a genus of early animals whose relationship to living animals is unclear. Fossils of Spriggina are known from the late Ediacaran period in what is now South Australia. Spriggina floundersi is the official fossil emblem of South Australia; it has been found nowhere else.

Praecambridium sigillum is an extinct organism that superficially resembles a segmented trilobite-like arthropod. It was originally described as being a trilobite-like arthropod, though the majority of experts now place it within the Proarticulata as a close relative of the much larger Yorgia. It is from the Late Ediacaran deposit of Ediacara Hills, Australia, about 555 million years ago. On average, P. sigillum had at least 5 pairs of segments, with each unit becoming progressively larger as they approach the cephalon-like head.

Marywadea is an extinct proarticulate organism from the late Ediacaran of Australia. Originally described under Spriggina, it is a monotypic genus, containing only Marywadea ovata.