This taxon approximates the concept of (Hustedt (1930) in figure 380. There is some question as to the true identity of this taxon because it doesn't have parallel sides. It has slight, weakly developed undulations of the sides. We differ from Krammer and Lange-Bertalot (1985,1986) in that our specimen shows a scythe proximal raphe end instead of a crochet hook end in the marginal character, and the areolae are more finely structured ( Hudstedt 1930).