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Fig. 4 | BMC Biology

Fig. 4

From: Cambrian suspension-feeding tubicolous hemichordates

Fig. 4

a, b Spirally arranged pores perforate the tube (ROM 63716; see also Additional file 9A). c Two examples of multiple bifurcation points in a single specimen. Extreme size variation underscores the fragmentary nature of most tubes (left: KUMIP 204373, right: KUMIP 241392). d, e Tube showing three-dimensional preservation. d Large section of the tube has been broken off revealing the other side of the tube. e The broken segment has been placed back in its original configuration to illustrate the three-dimensionality of the tube (KUMIP 147911). f, g Close-up of the pores and fibrous texture of the tube. Individual fibres are micrometre small (ROM 63705). Bi: node of bifurcation, Fe: fibrous elements, Lo: lower surface, Po: pores, Up: upper surface, Wo: worm, other acronyms see Fig. 2. Scale bars: a, b, f, g = 5 mm, ce = 10 mm

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