| Author Title Journal |
Hyman LH (1929) Studies on the morphology, taxonomy, and distribution of North American triclad Turbellaria. II. On the distinctions between Planaria agilis and Planaria dorotocephala with notes on the distibution of agilis in the western United States. Transact Amer Microsc Soc 48: 406-415 |
Abstract / Notes
The two species are probably distinct although but slight differences exist between them; these concern color, entrance of oviducts into the bursa stalk, and size and shape of the seminal vesicles. New records for P. agilis from Colorado, Wyoming, and California indicate that this species ranges from the eastern border of the Great Plains westward to the Pacific coast.
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