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Arkarua
Temporal range: Late Ediacaran, about 555 Ma
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Artist's restoration
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Echinodermata (?)
Class:
†Edrioasteroidea (?)
Genus:
†Arkarua Gehling, 1987
Species:
†A. adami
Binomial name
†Arkarua adami
Gehling, 1987
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.
Arkarua is known only from the Ediacaran beds of the Flinders Ranges in South Australia. The generic name refers to Arkaroo, a giant snake from the Dreaming of the local Aboriginal people.[1]
Arkarua is suggested to have been a passive suspension feeder.[2]
^Gehling, J.G. (1987). "Earliest known echinoderm — a new Ediacaran fossil from the Pound Subgroup of South Australia". Alcheringa. 11: 337–345. doi:10.1080/03115518708619143.
^García-Bellido, Diego C. (6 April 2021). "555 million-year-old fossils reveal early feeding strategies". Environment Institute Blog. The University of Adelaide. Archived from the original on 29 December 2023. Retrieved 29 December 2023.
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,...
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...
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...
earliest known, more or less undisputed edrioasteroid. The pentamerous Arkarua is older, dating from the late Precambrian, but with existing fossils of...
synonym of Onegia nenoxa (according to Grazhdankin, Ph.D. ms.). Russia Arkarua Gehling 1987 Australia Armillifera Fedonkin 1980 Proarticulata Russia...
Cambrian aged sediments, and possibly Ediacaran sediments in the form of Arkarua (but the taxonomy of those specimens has been quite controversial). In...
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...
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