Emerging Topics in Life Sciences (2018) https://doi.org/10.1042/ETLS20170160

Throughout the text of the Ahead-of-Print version of this article published online on 29 June 2018, the authors cite the dates 914–850 million years ago (Ma) as representing the time interval between the last common ancestor (LCA) of Metazoa + Choanozoa and the LCA of Metazoa. The authors would like to note that these dates come from Supplementary Table S1 of Dohrmann & Wörheide 2017, and reflect the Ctenophora-sister topology, as opposed to the topology presented in the main text of Dohrmann and Wörheide [1], where Porifera are sister to the rest of animals, with Ctenophora sister to Cnidaria (i.e. Coelenterata). This latter topology yields an alternative estimate of 906–814 Ma, which is now displayed in the corrected versions of Figures 1 and 3, presented here. A third scenario — Porifera sister to the rest of animals, with Ctenophora sister to Placozoa + Cnidaria + Bilateria — additionally yields the estimate of 925–855 Ma, as reported in Supplementary Table S2 of Dohrmann & Wörheide [1]. Since it remains unclear which of these topologies is correct, these different phylogenetic scenarios, and their varying molecular clock estimates, need to be considered when discussing the chronology of early animal evolution.

In addition, the spelling of ‘Hanson’ has been corrected in the updated version of Figure 2, presented here.

Figures 1, 2 and 3 have also been corrected in the version published in volume 2, issue 2 (pages 289–298).

Timeline of the six major lineages with complex multicellularity.

Figure 1.
Timeline of the six major lineages with complex multicellularity.

Bars display the highest confidence intervals (95%) for the age of the LCA of each clade, as taken from different molecular clock (MC) analyses. Diamonds indicate the mean estimates for the age of each LCA. Abbreviations for geological periods: Cr, Cryogenian; Ed, Ediacaran; C, Cambrian; O, Ordovician; S, Silurian; D, Devonian; C, Carboniferous; P, Permian; T, Triassic; J, Jurassic; K, Cretaceous; Pe, Paleogene; N, Neogene. References for molecular clock analyses: Metazoans [16,53,61,62], Florideophytes [44,56,63], Ascomycota [64], Basidiomycota [64], Embryophytes [65–67], and Laminarialeans [68]. References for and biomarkers earliest fossils: Metazoans [57,69,70], Florideophytes ([71] — though see [42]), Ascomycota [72], Basidiomycota [73], Embryophytes [74,75] and Laminarialeans [76].

Figure 1.
Timeline of the six major lineages with complex multicellularity.

Bars display the highest confidence intervals (95%) for the age of the LCA of each clade, as taken from different molecular clock (MC) analyses. Diamonds indicate the mean estimates for the age of each LCA. Abbreviations for geological periods: Cr, Cryogenian; Ed, Ediacaran; C, Cambrian; O, Ordovician; S, Silurian; D, Devonian; C, Carboniferous; P, Permian; T, Triassic; J, Jurassic; K, Cretaceous; Pe, Paleogene; N, Neogene. References for molecular clock analyses: Metazoans [16,53,61,62], Florideophytes [44,56,63], Ascomycota [64], Basidiomycota [64], Embryophytes [65–67], and Laminarialeans [68]. References for and biomarkers earliest fossils: Metazoans [57,69,70], Florideophytes ([71] — though see [42]), Ascomycota [72], Basidiomycota [73], Embryophytes [74,75] and Laminarialeans [76].

Comparison between different animal origin scenarios.

Figure 2.
Comparison between different animal origin scenarios.

Animals (and hypothetical multicellular ‘animal’ lineages) are identified in green. The blue line and arrow indicate a ‘key’ environmental event or change that allows ‘primed’ unicellular eukaryotes to finally achieve animal multicellularity.

Figure 2.
Comparison between different animal origin scenarios.

Animals (and hypothetical multicellular ‘animal’ lineages) are identified in green. The blue line and arrow indicate a ‘key’ environmental event or change that allows ‘primed’ unicellular eukaryotes to finally achieve animal multicellularity.

Timeline of the Neoproterozoic Era.

Figure 3.
Timeline of the Neoproterozoic Era.

(A) Combined confidence intervals for molecular clock estimates from Figure 1 (bars) and dataset means (diamonds) for metazoans and florideophytes [16,44,53,56,61–63,69–71]; (B) within assemblage diversity (WAD — number of unique fossil taxa described per fossiliferous stratigraphic unit), taken from ref. [45]; (C) chromium isotope record aggregated from multiple studies [51,52,54,77–79]; (D) Sterane/hopane ratios from ref. [55] and (E) relative fractions of cholestane, ergostane, and stigmastane (C27, C28, and C29, respectively) from ref. [55].

Figure 3.
Timeline of the Neoproterozoic Era.

(A) Combined confidence intervals for molecular clock estimates from Figure 1 (bars) and dataset means (diamonds) for metazoans and florideophytes [16,44,53,56,61–63,69–71]; (B) within assemblage diversity (WAD — number of unique fossil taxa described per fossiliferous stratigraphic unit), taken from ref. [45]; (C) chromium isotope record aggregated from multiple studies [51,52,54,77–79]; (D) Sterane/hopane ratios from ref. [55] and (E) relative fractions of cholestane, ergostane, and stigmastane (C27, C28, and C29, respectively) from ref. [55].

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