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Fig. 3 | BMC Biology

Fig. 3

From: Tube-dwelling in early animals exemplified by Cambrian scalidophoran worms

Fig. 3

Selkirkia sinica from the early Cambrian Chengjiang Lagerstätte: relation between trunk and tube. a, b ELI-0002016, showing tube wall (external and internal boundaries outlined by very pale coloured layers; see black arrows), general view and close-up. c, d ELI-0002013, showing tube wall (as in b), general view and close-up. e–g ELI-0002017, showing anterior part of trunk protruding outside the tube; trunk cuticle appears as a thin dark layer (white arrows), SEM image showing tube wall preserved in iron oxides. Abbreviations: tb, trunk boundary; tw, tube wall. Scale bars represent a, e 5 mm; c 2 mm; d 1 mm; f 400 μm; b 200 μm; and g 100 μm

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