Because Millerelix gracilis is not a regularly studied snail, its specific diet and feeding habits are not commonly known. However, relatives of this snail can expose similarities and the tendencies of Millerelix gracilis.
The phylum Mollusca (which includes Millerelix gracilis) is known to feed on fungi (Wolf et. al., 1939). Trails and designs in fungi found on leaves are how scientists determined this as a food source (Wolf et. al., 1939).
                                                                                                                                             Magnified snail radula (Image by Rick Gillis)
A snail feeds by stretching its body out of his shell (Wolf et. al., 1939). Then, it scrapes fungi in a circular motion with a mouthpart called the radula (Wolf et. al., 1939). Finally, it creeps forward and continues to feed (Wolf et. al., 1939).
The radula is most comparable to a tongue (Hickman et. al., 2012). Tooth-like projections on this “tongue” are made of chitin, a substance also found in invertebrate exoskeletons (Hickman et. al., 2012 and European Chitin Society, 2005). These teeth are specifically what scrapes the fungi (Hickman et. al., 2012).

                     Snail in environment (Image by Encyclopedia of Life)

The image above by Rick Gillis shows a microscopic view of the chitinous teeth on the radula (Gillis, 2012). After passing through the mouth with the radula, the food continues along the digestive tract through the crop where food can be stored before entering the stomach, intestine, and finally the anus (Hickman et. al., 2012 and Gillis, 2012).
The circulatory system of Gastropods is open, meaning, the “blood” (referred to as hemocoel) is pumped into cavities throughout the snail, rather than being transported through veins and arteries (Gastropoda, 2000).

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