NPSpecies

Specimen(s) collected during a study of coastal rock pools of Lake Superior at Isle Royale. Two shoreline zones were differentiated using a line between upslope “lichen zone” pools and downslope “splash zone” pools. See citation for details. Distribution — Wide Nearctic distribution, from AK to ME and south to CA and GA. Ecology — Diet probably includes predation of small invertebrates, including chironomids, and collector-gatherer of detritus and diatoms. Usually lotic, but also in lakes and springs. Remarks — IRNP specimens from splash zone pools. In Makarchenko and Makarchenko specimens cannot be separated from P. lanceolata, but all clearly the Lake Superior variant described by Caldwell.