Petaloconchus glomeratusPetaloconchus glomeratus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.DescriptionShells of Petaloconchus glomeratus can reach a size of. They are elongated, tubular, and extremely irregular. These "worm shells" usually grow cemented in colonies onto a hard substrate.DistributionThis species is present in the Mediterranean Sea - Eastern Basin and in North Atlantic Ocean.