Petaloconchus glomeratus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.

[1] Shells of Petaloconchus glomeratus can reach a size of 2–7 millimetres (0.079–0.276 in).

They are elongated, tubular, and extremely irregular.

These "worm shells" usually grow cemented in colonies onto a hard substrate.

[2] This species is present in the Mediterranean Sea - Eastern Basin and in North Atlantic Ocean.