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Movie S1. A free-swimming sperm of Macrostomum lignano. Note the undulating movements of the feeler and the shaft. The nucleus can be seen in the posterior half of the shaft, forming a chain-like structure.

Movie S2. ‘Probing’ behaviour of the feeler of Macrostomum lignano sperm in the female antrum. Most sperm are polarized and only their brushes can be seen (right-bottom quadrant). Some sperm are unanchored and move in the antral lumen. Note the sperm in the middle, which actively touches the antral epithelium with its feeler, the so-called ‘probing’ behaviour.

Movie S3. Sperm of Macrostomum lignano anchored in the cellular valve of the female antrum. Note the feelers radiating towards the sides of the cellular valve.

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FilenameFormatSizeDescription
BIJ_1363_sm_Mov1.mov1481KSupporting info item
BIJ_1363_sm_Mov2.mov4011KSupporting info item
BIJ_1363_sm_Mov3.mov4371KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.