SUPPLEMENTARY ANIMATION 1. Animation (.mov format; 24 sec) compiled using Avizo software showing the rotation of an isosurface rendering of a Burejospermum seymourense cocoon-wall fragment (NRMS089729) generated from Synchrotron-radiation-based X-Ray tomographic microscopy (SRXTM) at the TOMCAT beamline of the Swiss Light Source at the Paul Scherrer Institute, Switzerland, using a beam energy of 10 kV and a 20× objective. Note the relatively smooth (inner) alytine and filamentous (outer) hapsine with embedded mineral matter. Click on image to see animation.

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SUPPLEMENTARY ANIMATION 2. Animation (.mov format; 24 sec) compiled using Avizo software showing the rotation of a volume rendering of a Burejospermum seymourense cocoon wall fragment (NRMS089729) generated from Synchrotron-radiation-based X-ray tomographic microscopy (SRXTM) at the TOMCAT beamline of the Swiss Light Source at the Paul Scherrer Institute, Switzerland, using a beam energy of 10 kV and a 20× objective. Note the irregular distribution of entombed mineral matter (white) and the hollow tube in the lower portion of the wall fragment that may represent the original position of a withdrawn seta. Click on image to see animation.

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SUPPLEMENTARY ANIMATION 3. Composite orthoslice animation (.mov format; 24 sec) of 1461 steps through a Burejospermum seymourense cocoon wall fragment (NRMS089729) using Avizo software. Orthoslice data obtained via synchrotron-radiation-based X-ray tomographic microscopy at the TOMCAT beamline of the Swiss Light Source at the Paul Scherrer Institute, Switzerland, using a beam energy of 10 kV and a 20× objective. Note the similar composition of the dense (inner) alytine and filamentous (outer) hapsine; the hollow pseudo-segmented tube in the lower left portion parallel to the cocoon surface may represent the original position of a withdrawn seta; some smaller cavities in the alytine represent moulds of encased spermatozoa and micro-organisms. Click on image to see animation.

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SUPPLEMENTARY ANIMATION 4. Animation of a three-dimensional volume rendering (.mov format; 24 sec) of a Burejospermum seymourense cocoon wall fragment (NRMS089729) compiled from segmented computed tomographic data to illustrate an enclosed tubular structure (possible setal anchoring trace) highlighted in yellow that is flared at one end and tapers distally. Click on image to see animation.

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