Probably Aulophorus sp. help ID

[carlos.uruguay]

We suppose that the annelid of the video is Aulophorus sp.,
a curious fresh water worm
whose 'tail' has 'hand' form and is formed by covered cilios gills
and serve to trap the oxygen
In the video we see as Aulophorus eats and expels the stones
and waste by the 'tail'
Oblique light and dark field
Link:
http://www.youtube.com/watch?v=wLmI9NW4Wag
Regards
carlos
Pd. If someone knows more on this anelido that only has 4 gills I am grateful for any information