Can anyone identify these flat worms ?

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Ulfert Graefe

The 4 brownish worms could be Mesostoma ehrenbergi or a similar species. The green one with zoochlorellae might be a Typhloplanidae (e.g. Typhloplana viridata or Castrada viridis).

Best, Ulfert

Jean François Cart

Yes they look like Mesostoma, but I found Mesostoma ehrenbergi in a temporary pond, and Mesostoma tetragonum in the river Seine.

https://www.flickr.com/photos/jfcart/18235081854/in/album-72157627117360349/

They are both larger than these flat worms.

Anyway, they are certainly Typhloplanidae, and may be Rhynchomesostoma.

bests, Jean-François