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...
4 KB (340 words) - 19:30, 29 December 2023
preserved to analyze its characteristics. One much earlier form called Arkarua has been hypothesized to be an ancestral echinoderm because of its fivefold...
5 KB (464 words) - 00:29, 4 September 2024
may not extend into the Precambrian (provided the enigmatic Ediacaran Arkarua can be positively identified as an edrioasteroid). The classes currently...
3 KB (239 words) - 18:48, 24 August 2024
such their true affinity remains uncertain. Another Ediacaran fossil, Arkarua, may represent the earliest echinoderm, while Yanjiahella from the early...
35 KB (3,201 words) - 04:03, 6 October 2024
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...
79 KB (8,660 words) - 06:57, 7 September 2024
More than 100 genera have been described, and well known forms include Arkarua, Charnia, Dickinsonia, Ediacaria, Marywadea, Cephalonega, Pteridinium,...
37 KB (3,654 words) - 11:54, 15 September 2024
however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...
234 KB (22,713 words) - 19:23, 14 September 2024
however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...
304 KB (29,025 words) - 06:15, 17 October 2024
needed] having been interpreted as early molluscs (Kimberella), echinoderms (Arkarua); and arthropods (Spriggina, Parvancorina, Yilingia). Still, debate exists...
134 KB (15,430 words) - 21:43, 22 September 2024
earliest known, more or less undisputed edrioasteroid. The pentamerous Arkarua is older, dating from the late Precambrian, but with existing fossils of...
2 KB (190 words) - 20:35, 23 June 2023
however, have been interpreted as early molluscs (Kimberella), echinoderms (Arkarua), and arthropods (Spriggina, Parvancorina). There is still debate about...
63 KB (6,568 words) - 03:23, 8 October 2024
Some authors propose that an enigmatic Ediacaran (about 600 Ma) organism Arkarua is also an edrioasteroid, but this interpretation did not gain wide acceptance...
8 KB (797 words) - 19:39, 19 September 2024
synonym of Onegia nenoxa (according to Grazhdankin, Ph.D. ms.). Russia Arkarua Gehling 1987 Australia Armillifera Fedonkin 1980 Proarticulata Russia...
83 KB (5,004 words) - 15:53, 10 October 2024
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...
321 KB (27,999 words) - 04:22, 8 July 2024
Cambrian aged sediments, and possibly Ediacaran sediments in the form of Arkarua (but the taxonomy of those specimens has been quite controversial). In...
7 KB (588 words) - 12:37, 7 January 2024
†Argentinaster †Argoviaster †Arisaigaster †Aristocystites †Arkacrinus †Arkarua? †Arkonaster †Armathyraster †Armenocrinus †Arnaudaster †Arrectocrinus †Arroyocrinus...
73 KB (3,151 words) - 01:57, 14 September 2022