Stidolph, S.R. (1993). Observations and remarks on morphology and taxonomy of the diatom genera Gyrosigma Hassall and Pleurosigma W. Smith II. Gyrosigma waitangiana sp. nov. and Pleurosigma sterrenburgii sp. nov. Nova Hedwigia, 56(1-2): 139-153, 37 figs.