Serpula anguina Linnaeus, 1758 Serpula muricata Born, 1780 Serpula volvox Dillwyn, 1817 Tenagodes anguinus Linnaeus, 1758 Tenagodus anguinus is a species of unusual sea snail, a marine gastropod mollusk in the family Siliquariidae, the slit worm shells.

The shell is thick and irregularly coiled in a gradually tapered spiral, with rather distant whorls.

It has longitudinal ridges with spines on them throughout its length.

It is generally a dirty-looking white colour, pale yellow or buff.

[2][3] Tenagodus anguinus is found in the Indian Ocean including around Madagascar.