Earliest known echinoderm — a new Ediacaran fossil from the Pound Subgroup of South Australia
Abstract
Arkarua adami gen. et sp. nov., a small disc-like animal with a pentameral arrangement of grooves on its oral surface, is preserved as an external mould on the base of sandstone beds within the Ediacaran (Late Precambrian) Ediacara Member of the Pound Subgroup, in the Flinders Ranges. While the limitations of preservation do not allow identification of some important organs, the pentameral symmetry and resemblance to Early Cambrian edrioasteroids enable the recognition of Arkarua as the earliest known echinoderm.
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If the Vendian Arkarua is correctly interpreted as an echinoderm, the important events in echinoderm phylogenesis must have occurred in the Precambrian, regardless of the lack of preserved fossils.
“If the Vendian Arkarua is correctly interpreted as an echinoderm (Gehling, 1987), the important events in their phylogenesis must have occurred in the Precambrian, regardless of the lack of preserved fossils.”
From The Cambrian evolutionary ‘explosion’: decoupling cladogenesis from morphological disparity (1996) · cites this paper as Gehling, 1987
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- Authors
- Gehling, J. G.
- Venue
- Alcheringa: An Australasian Journal of Palaeontology
- Publisher
- Informa UK Limited
- Published
- 1987-01
- Volume
- 11
- Issue
- 4
- Pages
- 337-345
- ISSN
- 0311-5518 (ISSN-L)
- 1752-0754
- OpenAlex
- W2009672868
- Cited by
- 93
- References
- 17
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 2 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 3 · 2014: 3 · 2013: 4 · 2012: 3
- FWCI
- 2.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Alcheringa An Australasian Journal of Palaeontology (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Keywords
- Ediacaran, new genus and species, Ediacara Member, Flinders Ranges, edrioasteroids, Lower Cambrian
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