Live Monosiga 4ms exposure shows flagella beating (c.f. same choano at 200ms exposure)
Mark J. Dayel
CC BY-SA 3.0
<a rel="nofollow" class="external free" href="http://www.choano.org/wiki/Choanoflagellate_Gallery#Monosiga_Brevicollis_Gallery">http://www.choano.org/wiki/Choanoflagellate_Gallery#Monosiga_Brevicollis_Gallery</a>