Sertularia distans is a small colonial species of hydroids with symmetrically arranged
polyps. It was found growing on the brown macroalga Sargassum vulgare growing on a
cliff face, as well as on Dictyopetris sp.
The photographic material taken at the time is unfortunately not of the expected quality.
However the specimen listed here is described in more detail (p. 189 & Fig. 5c-e)in the
following paper published (2013) by Soto Àngel and Peña Cantero.