Before revision:  Here we present a fully-automated method of flagellum identification from videomicroscopy based on the fact that the flagella appear to be of approximately constant width when viewed with typical optics. This approximate morphological characteristic, inherent in the ultrastructure of URLanelle, is conserved across many eukaryotes.
After revision:  Here we present a fully-automated method of flagellum identification from videomicroscopy based on the fact that the flagella appear to be of approximately constant width when viewed by microscopy.