10.1371/journal.pone.0176874
Scott D. Evans
Scott D.
Evans
Mary L. Droser
Mary L.
Droser
James G. Gehling
James G.
Gehling
Highly regulated growth and development of the Ediacara macrofossil <i>Dickinsonia costata</i>
Public Library of Science
2017
Dickinsonia costata
basal metazoans
taxa
bilaterally
animal groups
module
evidence
Eumetazoa
Ediacara macrofossil Dickinsonia costata
morphology
pattern
clade
affinity
South Australia
ancestor
gene sequencing
ovoid shape
bilaterian
Protostome
Deuterostome
gene networks
Ediacara Member
appearance
900 specimens
terminal addition
Ediacara Biota
2017-05-17 17:35:12
Dataset
https://plos.figshare.com/articles/dataset/Highly_regulated_growth_and_development_of_the_Ediacara_macrofossil_i_Dickinsonia_costata_i_/5013635
<div><p>The Ediacara Biota represents the oldest fossil evidence for the appearance of animals but linking these taxa to specific clades has proved challenging. <i>Dickinsonia</i> is an abundant, apparently bilaterally symmetrical Ediacara fossil with uncertain affinities. We identified and measured key morphological features of over 900 specimens of <i>Dickinsonia costata</i> from the Ediacara Member, South Australia to characterize patterns in growth and morphology. Here we show that development in <i>Dickinsonia costata</i> was surprisingly highly regulated to maintain an ovoid shape via terminal addition and the predictable expansion of modules. This result, along with other characters found in <i>Dickinsonia</i> suggests that it does not belong within known animal groups, but that it utilized some of the developmental gene networks of bilaterians, a result predicted by gene sequencing of basal metazoans but previously unidentified in the fossil record. <i>Dickinsonia</i> thus represents an extinct clade located between sponges and the last common ancestor of Protostomes and Deuterostomes, and likely belongs within the Eumetazoa.</p></div>