serpula

Etymology
From. See.

Noun

 * 1)  Any of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family  that secrete a calcareous tube, usually irregularly contorted, but sometimes spirally coiled, with a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.

Etymology
From. Seems to end in the diminutive suffix and function as a diminutive of, although not directly built on the latter's stem.

Noun

 * 1) a little snake, a little serpent