Help identification of freshwater flagellated Strombomonas?

[carlos.uruguay]

Strombomonas girardiana?:
Strombomonas has a single flagellum, but the video has 2, what is it?
I appreciate any information to identify it
Body with form of amphora, two flagella.
The previous longest and directed forward
The later more short and facing backwards.
Your body is about 45um long
Found in fresh water
In the arroyo Tala (Route 3, 88 Km) of San José, Uruguay, South America.
Jamendo.com free music 'blame' Waterside
Oblique light, brightfield, phase contrast
Link:
http://www.youtube.com/watch?v=DcMXayZNng8
Regards
carlos