Species Trichotropis saintjohnensis Verkrüzen, 1877 accepted as Ariadnaria borealis (Broderip & G. B. Sowerby I, 1829) (synonym) Environment. marine. Original description. Broderip, W. J. & Sowerby, G. B. I. (1829). Observations on new or interesting Mollusca contained, for the most part, in the Museum of the Zoological Society.