Project 3868: J. F. Hoyal Cuthill. 2022. Ediacaran survivors in the Cambrian: suspicions, denials and a smoking gun. Geological Magazine. Early View:1-10.
Abstract
The relative timing of extinctions and originations is a foundation for reconstructing evolutionary causes. However, there has been a tendency to dismiss reported Ediacaran holdovers in favour of effective extinction around the Cambrian boundary. Here, focusing on the classically Ediacaran frondose biota (Petalonamae), I suggest four main reasons why proposed Ediacaran survivors have previously been denied the acceptance they deserve: denials based on mistaken identity, doppelgängers, a last gasp or dead clades walking. I then point to the lower Cambrian species Stromatoveris psygmoglena as a key example which simultaneously meets these objections. Collectively, Cambrian survivors are a ‘smoking gun’ showing that extinction of the classically Ediacaran frondose biota did not occur until at least 30 Ma after the end of the Ediacaran period, registered by phylogenetic petalonamid Thaumaptilon from the Burgess Shale. Therefore, to paraphrase Mark Twain, reports of their earlier demise have been greatly exaggerated. Causes of their ultimate extinction should instead be sought in their total range and diversity dynamics. Overall, the Ediacaran–Cambrian transition shows extremely low numbers of recorded survivors, but diversity dynamics are dominated by the Cambrian explosion. In this context, recorded occurrences for the classically Ediacaran frondose biota are compatible with at least two extinction events, one within a possible mass extinction near the Cambrian boundary, and later, their ultimate extinction in, or after, the middle Cambrian (Miaolingian Series, Wuliuan Stage). There is, however, no correlative basis for a causal link between the Cambrian transition and the effective or final demise of the classically Ediacaran soft-bodied biota.Read the article »
Article DOI: 10.1017/S0016756821001333
Project DOI: 10.7934/P2695, http://dx.doi.org/10.7934/P2695
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 763 Total media associated with cells: 668 Total labels associated with cell media: 687 |
Characters | |
Total characters: 42 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 85 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:41/1 |
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MorphoBank Project 3868
MorphoBank Project 3868
- Creation Date:
05 November 2020 - Publication Date:
22 March 2022 - Project views: 35822
- Matrix downloads: 7
Authors' Institutions
- University of Essex
Members
member name | taxa | specimens | media | media notes | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||||||||||
Jennifer Hoyal Cuthill Project Administrator | 20 | 73 | 95 | 57 | 42 | 0 | 35 | 0 | 0 | 763 (750, 0, 13) | 0 | 39 | 668 | 687 | 0 | ||||||||
Kenzley Alphonse | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M27075' (20 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Rangea Last Modified in 05/30/17 | 5 | 37 | 1 | 0 | 0 | 46 | 48 | 1 |
[2] † Stromatoveris Last Modified in 06/02/17 | 3 | 39 | 0 | 0 | 0 | 48 | 49 | 1 |
[3] † Pteridinium Last Modified in 09/04/17 | 7 | 35 | 0 | 0 | 0 | 47 | 50 | 1 |
[4] † Arborea Last Modified in 06/02/17 | 7 | 35 | 0 | 0 | 0 | 45 | 48 | 1 |
[5] † Thaumaptilon walcotti Last Modified in 11/08/20 | 16 | 26 | 0 | 0 | 0 | 42 | 44 | 1 |
[6] † Pambikalbae Last Modified in 06/02/17 | 8 | 34 | 0 | 0 | 0 | 44 | 47 | 1 |
[7] † Swartpuntia Last Modified in 06/02/17 | 8 | 34 | 0 | 0 | 0 | 42 | 45 | 1 |
[8] † Dickinsonia Last Modified in 09/04/17 | 6 | 36 | 0 | 0 | 0 | 50 | 51 | 1 |
[9] † Ernietta Last Modified in 06/02/17 | 8 | 34 | 0 | 0 | 0 | 46 | 48 | 1 |
[10] † Palaeopascichnus Last Modified in 09/11/17 | 1 | 40 | 33 | 0 | 1 | 0 | 0 | 1 |
[11] † Bosworthia Last Modified in 08/28/17 | 0 | 41 | 36 | 0 | 1 | 0 | 0 | 1 |
[12] Rhizocarpon Last Modified in 08/29/17 | 0 | 40 | 0 | 0 | 2 | 42 | 43 | 1 |
[13] † Thectardis Last Modified in 06/02/17 | 6 | 33 | 0 | 0 | 3 | 42 | 42 | 1 |
[14] † Leptomitus Last Modified in 09/04/17 | 1 | 38 | 0 | 0 | 3 | 42 | 42 | 1 |
[15] † Galeactena Last Modified in 08/08/17 | 1 | 41 | 0 | 0 | 0 | 42 | 45 | 1 |
[16] Trichoplax Last Modified in 08/29/17 | 0 | 39 | 0 | 0 | 3 | 46 | 37 | 1 |
[17] Fungia Last Modified in 09/04/17 | 0 | 42 | 0 | 0 | 0 | 44 | 48 | 1 |
[18] Pennatula Last Modified in 11/22/17 | 0 | 42 | 29 | 0 | 0 | 0 | 0 | 1 |
[19] Spinther Last Modified in 08/29/17 | 0 | 42 | 29 | 0 | 0 | 0 | 0 | 1 |
[20] † Pikaia Last Modified in 08/31/17 | 0 | 42 | 27 | 0 | 0 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 35822 | |
Project overview | 550 | |
Media views | 15086 | Media search (1057 views); M736100 (150 views); M708878 (159 views); M708910 (124 views); M708841 (174 views); M708893 (133 views); M708907 (133 views); M708928 (161 views); M708844 (164 views); M708845 (153 views); M708865 (163 views); M708867 (164 views); M708851 (156 views); M708847 (158 views); M708913 (135 views); M708861 (170 views); M708862 (168 views); M708897 (131 views); M708901 (131 views); M708857 (162 views); M708939 (129 views); M708882 (161 views); M708846 (182 views); M708891 (142 views); M708906 (133 views); M708864 (162 views); M708888 (144 views); M708887 (161 views); M708909 (134 views); M708915 (131 views); M708840 (173 views); M708876 (157 views); M708886 (160 views); M708902 (127 views); M708877 (172 views); M708914 (135 views); M708900 (133 views); M708919 (123 views); M708859 (160 views); M708892 (138 views); M708866 (157 views); M708896 (134 views); M708938 (127 views); M708858 (168 views); M708879 (177 views); M708898 (128 views); M708912 (146 views); M708937 (129 views); M708854 (162 views); M708904 (135 views); M708885 (159 views); M708908 (130 views); M708880 (158 views); M708853 (165 views); M708890 (138 views); M708922 (121 views); M708924 (131 views); M708860 (168 views); M708868 (162 views); M708921 (125 views); M708903 (123 views); M708863 (163 views); M708883 (166 views); M708920 (124 views); M708918 (134 views); M708848 (167 views); M708911 (122 views); M708905 (131 views); M708871 (159 views); M708932 (131 views); M708917 (132 views); M708849 (161 views); M708881 (158 views); M708856 (161 views); M708916 (147 views); M708935 (127 views); M708899 (128 views); M708850 (157 views); M708895 (128 views); M708870 (167 views); M708936 (131 views); M708869 (183 views); M708941 (126 views); M708894 (128 views); M708874 (162 views); M708940 (122 views); M708925 (121 views); M708842 (165 views); M708884 (166 views); M708873 (153 views); M708852 (158 views); M708889 (126 views); M708843 (158 views); M708855 (162 views); M708872 (156 views); M708875 (160 views); |
Matrix views | 423 | Matrix landing page (398 views); Petalonamae morphological character matrix (25 views); |
Views for media list | 1638 | |
Specimen list | 12824 | |
Taxon list | 2378 | |
Bibliography | 2918 | |
Documents list | 5 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 14 | |
Project downloads | 7 | |
Matrix downloads | 7 | Petalonamae morphological character matrix (7 downloads); |