Appendix 4—table 1. Measurement data of mastigonemes in TEM images.

Sample	No. of mastigonemes	Flagellum length ($\mathrm{\mu }\mathrm{m}$)	Density ($\mathrm{\mu }{\mathrm{m}}^{-1}$)
1	152	11.842	12.8357
2	168	11.597	14.4865
3	113	8.627	13.0984
4	181	13.590	13.3186
5	198	15.195	13.0306
6	177	13.994	12.6483
7	88	7.499	11.7349