Correction to ‘Ecological novelty at the start of the Cambrian and Ordovician radiations of echinoderms’

Abstract

Novack-Gottshall, P. M., Purcell, J., Sultan, A., Ranjha, I., Deline, B. and Sumrall, C. D. 2024. Palaeontology, 67, e12688.

Figure 6 should illustrate echinoderm phyloecospace through the Cambrian and Ordovician periods using the time-scaled UEH phylogeny number 49 as an example, but instead shows the alternative representation using the EAT topology (and phylogeny no. 57; see Fig. S6). This is the correct Figure 6:

FIG. 6

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Echinoderm phyloecospace through the Cambrian and Ordovician periods. Only the ecospace for the time-scaled UEH phylogeny number 49 is illustrated as one example; the remaining 49 time-scaled UEH phylogenies produce similar ordination structures. See Figure S6 for an alternative representation of ecospace using the EAT topology. Terreneuvian and Furongian epochs are plotted separately to the remaining Cambrian and Ordovician epochs to highlight changes occurring prior to diversification during the Cambrian and Ordovician radiations. First four principal coordinate (PCO) axes are illustrated, with each point representing some unique life habit, and colour-coded according to taxonomic class. The underlying time-scaled phylogeny represents the phylogenetic distribution of tip genera and ancestral nodes in the ecospace. The convex hull in each ordination is provided as a simple measure of overall ecospace occupied during each interval; the Terreneuvian and Furongian convex hulls are plotted as dashed lines in the subsequent temporal interval for comparison. Points are transparent to illustrate regions where multiple tips and ancestors overlap, with ancestral classes assigned when all descendants are assigned the same class, and with nodes illustrated as more transparent than tips. Taxonomic group ‘other’ includes the early blastoid Macurdablastus, coronate blastoid Mespilocystites, cyclocystoids, helicoplacoids, parablastoids, and taxa of uncertain class affiliation. The legend at bottom left illustrates the approximate positions of the four iconic ecological strategies mentioned in text. The first four axes account for 1.40, 0.40, 0.32, and 0.27% of explained relative eigenvalues in the 731-dimensional distance matrix. This figure is updated from Novack-Gottshall et al. (2022, fig. 2), which provides additional context.

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