This is Danilia octaviana, a tiny marine gastropod of the family Chilodontidae (the mollusk family Chilontidae—because of a taxonomic mishap, there is apparently a fish family of the same name). Danilia octaviana throughout the Mediterranean Sea (and in the Atlantic near the mouth of the Mediterranean). It is a tiny snail. Adults measure between 7 and 11 millimeters (about a third of an inch). It scrapes up algae and microscopic plants and bacteria with its radula, and is in turn eaten by numerous predators of all different stamps. There is nothing remarkable about Danilia octaviana: there are thousands of small snails like it which live at the margin of our attention (although that perhaps is remarkable, in its own way). Based on information on the internet, is a bit unclear whether the snail is currently alive or not (the photo above makes it seem like it is a fossil, but some sources speak about it today). I post it here because I think it is surprisingly beautiful and interesting as a textured sculptural whirl.