Overview

Distribution

North America. Introduced in Europe (Loch Ness).

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© Solà, Eduard

Source: Continenticola

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Swan's Island (Swans Island), Maine, USA
Collection date: prior to 1937
Salin: freshwater

Cambridge, Massachusetts, USA
Collection date: prior to 1937
Salin: freshwater
Comments: described by Girard and Woodworth from the vicinity of Cambridge.

New Haven Harbor, New Haven, Connecticut, USA
Collection date: prior to 1937
Salin: freshwater
Comments: typical specimens.

Yonkers, New York, USA
Collection date: prior to 1937
Salin: freshwater
Comments: spring-fed stream.

Princeton, New Jersey, USA
Collection date: prior to 1937
Salin: freshwater
Comments: specimens provided by Professor Dahlgren of Princeton, University.

New Haven Harbor, New Haven, Connecticut, USA
Collection date: 1933 or earlier
Salin: freshwater

New Haven Harbor, New Haven, Connecticut, USA
Collection date: 1931 or earlier
Salin: freshwater

Mount Desert Island, Maine, USA
Collection date: 1933 or earlier
Salin: freshwater

Powerhouse Brook, Craig Brook National Fish Hatchery, Orland, Maine, USA
Collection date: Aug 28, 1968
Salin: freshwater
Comments: Powerhouse Brook near Orland, at entrance of road to Craig Brook National Hatchery, 1.4 miles east of the hatchery, in a dammed-up pond above the bridge on the road, 21.3 degrees C., 7 specimens under stones and pieces of wood.

Stillwater River, Penobscot County, Maine, USA
Collection date: Aug 28, 1968
Salin: freshwater
Comments: Stillwater River, below the dame at Stillwater, moderate current, 20.8 degrees C., several specimens (some mature) collected under stones.

Somerville, Massachusetts, USA
Collection date: 1891 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1901 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1904 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1906 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1907 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1908 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1909 or earlier
Salin: freshwater

Falmouth, Massachusetts, USA
Collection date: 1931 or earlier
Salin: freshwater

Woods Hole,Cape Cod, Massachusetts, USA
Collection date: 1900 or earlier
Salin: freshwater

Woods Hole,Cape Cod, Massachusetts, USA
Collection date: 1900 or earlier
Salin: freshwater

Woods Hole,Cape Cod, Massachusetts, USA
Collection date: 1913 or earlier
Salin: freshwater

Seekonk, Bristol County, Massachusetts, USA
Collection date: 1941 or earlier
Salin: freshwater

Bradley Palmer State Park, Ipswich River, Essex County, Massachusetts, USA
Collection date: Jan 1970
Salin: freshwater
Comments: 2 mature specimens collected by Dr. R.A. Raff.

Concord, Middlesex County, Massachusetts, USA
Collection date: 1957 or earlier
Salin: freshwater
Comments: spring in Concord, together with Phagocata morgani.

Province of New Brunswick, Canada
Collection date: 1969 or earlier
Salin: freshwater
Comments: and personal communciation from Ball to Kenk.

Port-aux-Basques, Province of Newfoundland, Canada
Collection date: 1952 or earlier
Salin: freshwater

Province of Newfoundland, Canada
Collection date: 1969 or earlier
Salin: freshwater
Comments: personal communication from Ball IR.

Table Mountain, Province of Newfoundland, Canada
Collection date: 1952 or earlier
Salin: freshwater

Province of Nova Scotia, Canada
Collection date: 1969 or earlier
Salin: freshwater
Comments: personal communciation from Ball IR to Kenk.

Saint Lawrence River, Ontario, Canada
Collection date: 1969 or earlier
Salin: freshwater

Saint Lawrence River, Ontario, Canada
Collection date: 1969 or earlier
Salin: freshwater
Comments: personal communciation from Ball IR to Kenk.

Anticosti Island, Province of Quebec, Canada
Collection date: 1970 or earlier
Salin: freshwater

Invermoriston, Loch Ness, Scotland, United Kingdom
Collection date: 1981 or earlier
Salin: freshwater
Comments: stony shore at Invermoriston, a few miles north of Fort Augustus. Introduced species [see note]
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© National Science Foundation - Turbellarian Taxonomic Database

Source: Turbellarian Taxonomic Database

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Names and Taxonomy

Taxonomy

Hyman LH 1937 (citation)- Discussion of this species and confusing it with P. gracilis. She notes: 'I have had specimens of this species from Swan's Island, Maine; it was described by Girard and Woodworth from the vicinity of Cambridge, Massachusetts, where I also have found it; and I have taken typical specimens at New Haven, Connecticut. Material found in a spring-fed stream near Yonkers, New York, has also proved to be P. woodworthi and specimens sent to me from Princeton, New Jersey, through the kindness of Professor Dahlgren of Princeton University, were either identical with New England specimens in the details of the copulatory apparatus or differed slightly from them. The Delaware River therefore constitutes the boundary betweehn P. gracilis and P. woodworthi with some evidence of transitional features in New Jersey material.' 

 Kenk R 1972 (citation)- p 44, "Northeastern parts of the U.S. north of the Delaware River and eastern Canada as far west as Ontario." 

 Kenk R 1970 (citation)- p 13, 'Little is known about the ecological requirements of P. woodworthi. It is generally taken in ponds and rivers, more rarely in cold streams and springs. The fact that it often shares its habitat with such eurythermic species as Dugesia tigrina (Girard) and Procotyla fluviatilis Leidy suggests that it tolerates greater temperature fluctuations that does P. gracilis.' 

 Ball & Reynoldson 1981 (citation)- p. 88, "The introduction of thos species has probably occurred from cocoons on equipment brought over by American scientists in search of the Loch Ness 'Monster'. It is a large and vigorous species and its spread in Britain should be monitored."
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© National Science Foundation - Turbellarian Taxonomic Database

Source: Turbellarian Taxonomic Database

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