Fig. 4
From: Tube-dwelling in early animals exemplified by Cambrian scalidophoran worms
Selkirkia sinica from the early Cambrian Chengjiang Lagerstätte: possible brachiopod epibionts and possible faecal pellets. a ELI-0002018, showing damaged posterior part of tube. b, c ELI-0002017, showing protruding part of trunk and possible brachiopod shell near tube end. d, e ELI-0002019, showing possible brachiopod attached near the posterior end of tube. f–h ELI-0002020, showing possible brachiopod attached near the posterior end of tube. i–k ELI-0002021, showing possible brachiopod attached to the tube and tube annulations. l, m ELI-0002022, showing possible brachiopod fragment near the posterior end of tube. n ELI-0002023 and o ELI-0002024, showing possible faecal pellets released from the posterior opening of the tube (e.g. undigested coarse sediment particles). g, k and m are XRF images to show elemental differences between tube and possible brachiopod. Abbreviations: an, annulations, bs, possible brachiopod shell; cte, cracked tube end; pfp, possible faecal pellets; tb, trunk boundary; tr, trunk; ttu, tapered tube end. Scale bars represent a, b, e, f, j, l, n and o 5 mm; c, d, h and i 1 mm