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Title: Functional morphology of the Ediacaran organism Tribrachidium heraldicum
Abstract Tribrachidium heraldicumis an Ediacaran body fossil characterized by triradial symmetry. Previous work has suggested that the anatomy ofTribrachidiumwas conducive to passive suspension feeding; however, these analyses used an inaccurate model and a relatively simple set of simulations. Using computational fluid dynamics, we explore the functional morphology ofTribrachidiumin unprecedented detail by gauging how the presence or absence of distinctive anatomical features (e.g., apical pits and arms) affects flow patterns. Additionally, we map particle pathways, quantify deposition rates at proposed feeding sites, and assess gregarious feeding habits to more fully reconstruct the lifestyle of this enigmatic taxon. Our results provide strong support for interpretingTribrachidiumas a macroscopic suspension feeder, with the apical pits representing loci of particle collection (and possibly ingestion) and the triradial arms representing morphological adaptations for interrupting flow and inducing settling. More speculatively, we suggest that the radial grooves may represent ciliated pathways through which food particles accumulating in the wake of the organism were transported toward the apical pits. Finally, our results allow us to generate new functional hypotheses for other Ediacaran taxa with a triradial body plan. This work refines our understanding of the appearance of suspension feeding in shallow-water paleoenvironments, with implications for the radiation of Metazoa across the Ediacaran/Cambrian boundary.  more » « less
Award ID(s):
2007928
PAR ID:
10549759
Author(s) / Creator(s):
; ; ; ; ; ; ;
Publisher / Repository:
Cambridge Core
Date Published:
Journal Name:
Paleobiology
ISSN:
0094-8373
Page Range / eLocation ID:
1 to 15
Subject(s) / Keyword(s):
Ediacaran evolution, suspension feeding functional morphology computational fluid dynamics
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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