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Figure F12. A–F. Scolecia cf. serrata (SEM images of resin casts of boreholes) is regarded as morphological variant of S. serrata. S. cf. serrata shows the same characteristics as S. serrata (Fig. F11) but the galleries are slightly thicker (clearly visible in D and E). The supposed association with a spherelike trace such as Saccomorpha sphaerula is eye-catching. The spherical aggregates (“bags of wool;” arrows in A and B) are produced by S. cf. serrata twining around the assumed spherical fungal traces. The fungal traces might be indicated by thin hyphae emerging from the bags of wool (arrows in C–F). S. cf. serrata was exclusively recorded inside coral skeleton.

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