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Fig. 2 | Swiss Journal of Palaeontology

Fig. 2

From: Crinoid encrustation of holocystitid diploporitan echinoderms: strongly asymmetrical Silurian dendritic attachment structures with palaeobiological implications

Fig. 2

Theca of the holocystitid diploporitan Holocystites scutellatus from the same locality and stratigraphic interval as that in Fig. 1. This specimen (CMC IP 88497) is also encrusted by a large Eucalyptocrinites radicular attachment structure. A View of the lateral surface of the diploporitan theca with the encrusting crinoid attachment structure along the thecal margin to the right side of the image. The arrow marks the disconnected radice segments that probably represent the maximum length of radices. The asterisk marks a prominently multi-plated radice. Scale bar = 10 mm. B Close-up of the attachment structure, showing the multitude of radices, their radial orientation and their multi-plated composition were not covered by a cortex. Note that the radices extending toward the central portion of the theca are long and well developed, whereas those extending farther outward toward the thecal margin are short, with one displaying a sharp change in direction, marked by the arrow, to run along the outermost edge of the theca. The asterisk marks the same multi-plated radice shown in A. Scale bar = 2 mm

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