Turbellarian taxonomic database
(citation)- p 11, "Kenk (1972) records P. velata as occuring in springs, streams, and spring-fed ponds, apparently
all across the continent, but the study of sexual material has occurred only in eastern North America. The
recognition that P. vernalis is not a valid species means that Kenk's (1972) distributional data referring to
temporary ponds can also be applied to P. velata. The exact range of P. velata is not known, and in western
North America there are superficially very similar species, which show fragmentation, and which nevertheless
are morphologically and karyologically distinct (Ball and Gourbault, 1975)."
Kenk R 1972 (citation)- p 35, "In springs, streams, and spring-fed ponds, apparently all across the continent."
Notes from synonyms