Dear Eric,
I have just watched your video and I think it shows common earthworms
with a multicolor (blue and green) surface effect due to iridescence
plus in some segments the yellow of chloragogue tissue showing
through the body wall.
Iridescence is a purely physical phenomemon commonly seen in
earthworms, being produced by the fibrous (collagenous) nature of the
cuticle causing diffraction of light.
Earthworm bioluminescence would not have that appearance in daylight.
Emilia
