Recent Species
Dolichospermum brachiatum G.B.McGregor & Sendall
Caloneis brevis f. intermedia Kisselev
Biddulphia aurita var. polyspina Kisselev
Triceratium spinosum f. tetragonum Hustedt
Trigonium balaena (Ehrenberg) Cleve
Triceratium arcticum f. balaeana (Ehrenberg) Hustedt
Triceratium arcticum var. balaena (Ehrenberg) Cleve-Euler
Podosira hormoides var. arctica (Grunow) Hustedt
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