During many months a year the acquatic Planaria (F. notadena) living in a small pool in the La Balme cave are subjected to a drought with the complete drying out of their biotope; they support in situ this lack of water and, living in a latent way inside the clayey matrix. Thanks to the great hygroscopy of the clay, enough humidity stays around the Planarians to enable them to survive. During this period the Planaria may undergo spontaneous divisions resulting in their asexual multiplication.
Ginet, René and Rodolphe Puglisi.
Écologie de Fonticola notadena de Beauchamp (Turbellarié, Triclade) dans la grotte de La Balme (Isère, France); survie en période de sécheresse.
International Journal of Speleology,
Available at: http://scholarcommons.usf.edu/ijs/vol1/iss1/16