From the samplings of pond benthos is always present this helminth, someone already knows it? we think it's a flat worm.
Interesting material. Like to know what this is too, Looks like a Catenulida flatworm, something like Stenostomum sp. but I'm unfamiliar with this group.
What was the size , shape and type of movement shon by the worn. If is very small and crawl on stones, may be Planaria. If small and shows wriggling movement , may be nematode . If is long enough may be Gordius. Olegochaetes are also found at the bottom of ponds.
Dear Massimo ,
this is exactly Stenostomum (I agree with Ton), it is making chains – not sure leucops ? For precise identification need additional information. I measured respiration of this species! Article Ecophysiology of some groups of protozoa and small invertebrates.
Nor Gordius or Oligochaetes exactly!!! Flatworms, previously Microturbellarians. eg, lookLook https://www.youtube.com/watch?v=xEamcSvUUUg
Andrey
thank you all, the next time I meet these animals, I will try to measure, in the meantime I have some videos, the movement happens with sliding, I am more and more convinced that it is about Turbellarian
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