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...

preserved to analyze its characteristics. One much earlier form called Arkarua has been hypothesized to be an ancestral echinoderm because of its fivefold...

may not extend into the Precambrian (provided the enigmatic Ediacaran Arkarua can be positively identified as an edrioasteroid). The classes currently...

purpuratus Crinoid on a coral reef The oldest candidate echinoderm fossil is Arkarua from the Precambrian of Australia. These fossils are disc-like, with radial...

More than 100 genera have been described, and well known forms include Arkarua, Charnia, Dickinsonia, Ediacaria, Marywadea, Cephalonega, Pteridinium,...

earliest known, more or less undisputed edrioasteroid. The pentamerous Arkarua is older, dating from the late Precambrian, but with existing fossils of...

such their true affinity remains uncertain. Another Ediacaran fossil, Arkarua, may represent the earliest echinoderm, while Yanjiahella from the early...

however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...

Some authors propose that an enigmatic Ediacaran (about 600 Ma) organism Arkarua is also an edrioasteroid, but this interpretation did not gain wide acceptance...

however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...

needed] having been interpreted as early molluscs (Kimberella), echinoderms (Arkarua); and arthropods (Spriggina, Parvancorina, Yilingia). Still, debate exists...

however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...

Cambrian aged sediments, and possibly Ediacaran sediments in the form of Arkarua (but the taxonomy of those specimens has been quite controversial). In...

synonym of Onegia nenoxa (according to Grazhdankin, Ph.D. ms.).  Russia Arkarua Gehling 1987  Australia Armillifera Fedonkin 1980 Proarticulata  Russia...

†Argentinaster †Argoviaster †Arisaigaster †Aristocystites †Arkacrinus †Arkarua? †Arkonaster †Armathyraster †Armenocrinus †Arnaudaster †Arrectocrinus †Arroyocrinus...

by Evans et al. (2021). A study aiming to determine the feeding mode of Arkarua adami is published by Cracknell et al. (2021). A fossil specimen sharing...