rare marine bacteria? help id

[carlos.uruguay]

link:
http://www.youtube.com/watch?v=rd-gq5Azrm0

I found these bacteria? growing in a bottle of sea water heavily polluted
I not found any reference to them
Sometimes very mobile
Sometimes motionless
All have a hyaline area in their body
It measure about 12um long and a 4um width
It are reproduced by bipartition.
I could not see if it have flagella
Phase Contrast and oblique light
Regards
carlos