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These critters are candid white. The colours are not deformated by the photo, they're as seen in these pics. Even legs are whitish.
They're big, of the size of Lispe tentaculata (much bigger than Lispe candicans, or at least those candicans I saw in another place)
Unfortunately it was impossible to take good photos as they was resting in water surface on muddy terrain that I cannot enter in. I did the photos from far distance with the zoom, what allows not much detail. But I hope that with this colour they can be identifiable.
Habitat: Seaside brackish abandoned salines
Location: Punta Entinas, Almeria, south Spain
Date: 1st August 2021
Please help with the ID! Thanks!