Recent Species
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
Syracosphaera elevata Archontikis, Young & Cros
Syracosphaera rotaconica Archontikis, Young & Cros
Syracosphaera periperforata var. tridentata Archontikis, Young & Cros
Syracosphaera periperforata var. cylindrata Archontikis, Young & Cros
Syracosphaera periperforata (Kleijne) Archontikis, Young & Cros
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