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Hyman, L. H. (1939). North American Rhabdocoela and Alloeocoela. IV. Mesostoma macropenis, new species, from Douglas Lake, Michigan. The American Midland Naturalist. 21(3): 646–650.
Hyman, L. H. (1939). North American Rhabdocoela and Alloeocoela. IV. Mesostoma macropenis, new species, from Douglas Lake, Michigan. The American Midland Naturalist. 21(3): 646–650.
