I am not sure they are trapped. Sometimes it is very easy for them to go out of the water and they stay in the water. When we put them outside the water they go back in. They often are on the surface but some swimm under a few centimeters of water.

I am not sure they survive. But sometimes we have seen like a pack of nodles (sorry for my english) of small symphyla in the water, like they can reproduce there...

Dear Lips

That kind of arthropods live in wet area and water for reproduction, I think it is not trapped but it's the ideal environment to survive far of high temperature and lighting.

Best regards

Somewhat late but maybe still helpful

Little is known about Symphyla and flooding resistance

Helpful for you may be

Adis, J., U. Scheller, et al. (1997). "Symphyla from Amazonian non-flooded upland forests and their adaptations to inundation forests." Entomologica Scandinavica, Supplement 51: 307-318

and

Adis, J., J. Wellington de Morais, et al. (1996). On abundance, phenology and natural history of Symphyla from a mixedwater inundation forest in Central Amazonia, Brazil. Acta Myriapodologica. J.-J. Geoffroy, J.-P. Mauriés and M. Nguyen Duy-Jacquemin. Paris, Éditions du Muséum National d'Histoire Naturelle. 169: 607-616.

Cheers

Nikola

Many thanks fot these papers. I will read them with alacrity.

Cheers,

Josiane