Prehistoric invertebrates of Australia

Arkarua adami is a small, Precambrian disk-like fossil with a raised center, a number of radial ridges on the rim, and a five-pointed central depression marked with radial lines of five small dots from the middle of the disk center. Fossils range from 3 to 10 mm in diameter.

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.

Funisia is a genus of extinct, colonial sponge-like organisms from the late Ediacaran of South Australia. It is the most common genus within the fossils beds it is known from, and may have partially driven the paleoenvironment and paleoecology of the areas in which it was found by stopping other organisms from taking hold, or providing nutrients upon a mass death. It is a monotypic genus, containing only Funisia dorothea.

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.

Tarwinia is an extinct genus of stem-group flea known from a single species, T. australis, from the Early Cretaceous (Aptian) Koonwarra Fossil Bed of Victoria, Australia, it is the only member of the family Tarwiniidae, and the only stem-group flea known from the Southern Hemisphere.

Aviculopecten is an extinct genus of bivalve mollusc that lived from the Early Devonian to the Late Triassic in Asia, Australia, Europe, North America, and South America.