The PDF file includes:

• Section S1. Reynolds number and drag coefficient calculations for characterizing flow regimes
• Fig. S1. Field photographs of Ernietta aggregations likely representing bioherms.
• Fig. S2. Ernietta model construction for CFD analyses.
• Fig. S3. Select examples of CFD simulation setup.
• Fig. S4. Frontal surface area at respective burial depth for calculations.
• Fig. S5. CFD results for single-individual model.
• Fig. S6. CFD results for multiple-individual model.
• Fig. S7. CFD results for offset multiple-individual model.
• Fig. S8. CFD drag results and SA/V values for all models.
• Table S1. Size measurements of Ernietta from Farm Hansburg and Farm Kuibis in Namibia, collected summer 2016.
• Table S2. Sensitivity analyses for meshing.
• Legends for movies S1 and S2

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.avi format). 2D FSI simulation of Ernietta in perpendicular orientation.
• Movie S2 (.avi format). 3D FSI simulation of Ernietta in parallel orientation.