Achnanthes Tetradesmus dimorphus Achnanthaceae H. P. Gandhi Ernst Lemmermann List of the prehistoric life of Michigan Cancosa paleolake Michael D. Guiry Hoek, Mann and Jahns system Dicosmoecus gilvipes Pyrenoid Navicula depressa Scenedesmus Laguna Negra, Catamarca Karayevia amoena Taxonomy of Protista Lake Tauca Paleobiota of the La Brea Tar Pits