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The skeleton of the hexactinellid E. aspergillum (A) is built of tightly interacting spicules (B). In (C) it is visible that those spicules even fuse together (indicated by >). Scale bar: (A) 10 cm, (B) 1 cm) and (C) 100 μm. Adapted from [100] under the Creative Commons Attribution 4.0 International License.
