Fig. 7

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A. Epoxy resin casts of the microboring Orthogonum giganteum Glaub, 1994, oriented closely parallel to the external substrate surface of an articulated brachiopod (sample C31). B. Close-up of A, showing the cylindrical tunnels and the characteristic rectangular branching pattern. The small ridges on the tunnel surface are a xenomorphic ornament reflecting the brachiopod’s shell microstructure.
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