Complex sentence: This species is indistinguishable from "Serpulorbis zelandicus" in shell characteristics, except for coloration, tending to be darker brown to purplish-brown, but quite distinctive in coloration of the animal, and in the radula, especially the narrow shape of the central tooth.
Split into simpler sentences: This species is indistinguishable from "Serpulorbis zelandicus" in shell characteristics, except for the coloration, which tends to be darker brown to purplish-brown. However it is quite distinctive in the coloration of the animal and in the radula, especially the narrow shape of the central tooth.