1) White apex of retracted rhinophore.
2) Flap-like tubercles guarding the rhinophore.
3) Unipinnate gills concolorous with mantle.
4) Flap-like tubercles guard the gills when it is retracted.
5) Tubercles almost columnar or with narrower base, not broad based domes; concolorous with mantle apart from dark apical spot; mantle-spicules radiate from the base.
Cornwall. May 2018. :copyright: D. Fenwick.
Full SPECIES DESCRIPTION at flic.kr/p/2o8Nduc
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