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| NAS - Nonindigenous Aquatic Species |
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Common Name: an oligochaete
Synonyms and Other Names: Ripistes parasitica, Ripistes macrochaeta
Taxonomy: available through 
Identification: Dorsal setal bundles on segments VI-VIII are characterized by 2-16 giant hair setae, following segments have 1-3 moderately long hairs; Ventral setae are absent on segments IV and V; Stomachal dilation is sudden, beginning in segments VI or VII; Clitellum is located in ½ V – ½ VIII; spermathecal ampulla are large and baglike with a fairly long, well-defined duct; penial setae 2 per bundle with a simple hook; swims with sagittal movements; constructs fixed, hyaline tubes (Brinkhurst 1971, Brinkhurst and Jamieson 1971).
Note: segments are counted from anterior to posterior using roman numerals.
Size: 8mm
Native Range: R. parasita are native to Europe and Lake Baikal in Asia (Brinkhurst and Jamieson 1971).
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Interactive maps: Continental US, Alaska, Hawaii, Caribbean
Nonindigenous Occurrences:
This species has been found in Lake Huron, Lake Superior, and the St. Mary's River in Michigan (Winnell and Jude 1987; Grigorovich et al. 2003; Spencer and Hudson 2003); Lake Superior at Duluth Harbor in Minnesota (Grigorovich et al. 2003); and in the Chemung, Cohocton, Chenango, and Hudson rivers in New York (Mills et al. 1993); Lake Michigan, Lake Superior, Lake Huron, Thunder Bay, Chemung River, Chenango River near Binghamton, and Cohocton River near Campell, NY (Spencer 2003; Mills et al 1993).
Ecology: This aquatic oligochaete has been found in waters between 6m and 10m deep in the Great Lakes, both on bare, rocky substrates and amongst macrophyte vegetation (Barton 1984; Winnell 1987; Grigorovich et al. 2003). Specimens taken from riverine habitats occupied waters between 0.9m and 3.5m deep and in flow rates ranging from 0 to 50cm/s (Simpson 1984; Montz 1988).
Means of Introduction: The prevalence of R. parasita at sites near major shipping ports suggests invasion via international shipping (Winnel and Jude 1987).
Status: Established where collected. Additionally, Montz (1988) stated that the sporadic distribution of R. parasita could be the result of typical benthic sampling methods leading to either the loss or distruction of this organism, and that this Naidid may be much more widespread than records show.
Impact of Introduction: Unknown
Remarks:
References
Barton, D. R., and M Griffiths. 1984. Benthic Invertebrates of the Nearshore Zone of Eastern Lake Huron, Georgian bar, and North Channel. Journal of Great Lakes Research, 10(4):407-416.
Brinkhurst, R. O. 1971. A Guide to the Identification of British Aquatic Oligochaeta. Freshwater Biological Association. Scientific Publication No. 22, 2nd Ed.
Brinkhurst, R. O. and B. G. M. Jamieson. 1971. Aquatic Oligochaeta of the World. University of Toronto Press. Toronto and Buffalo.
Gregorovich, I. A., A. V. Korniushin, D. K. Gray, I. C. Duggan, R. I. Colautti, and H. J. MacIsaac. 2003. Lake Superior: and invasion coldspot? Hydrobiologia, 499:191-210.
Montz, G. R. 1988. The Occurance of Ripistes parasita (Oligochaeta:Naididae) in Minnesota and its Implications for Benthic Sampling. Journal of the American Benthological Society, 7(2):160-162.
Simpson, K. W. and L. E. Abele. 1984. Ripistes parasita (Schmidt) (Oligochaeta: Naididae), A Distinctive Oligochaete New to North America. Freshwater Invertebrate Biology, 3(1):36-41.
Winnell, M. H., and D. J. Jude. 1987. Benthic Community Structure and Composition Among Rocky Habitats in the Great Lakes and Keuka Lake, New York. Journal of Great Lakes Research, 13(1):3-17.
Author: Greg Jacobs
Contributing Agencies: 
NOAA - GLERL
Revision Date: 8/4/2005 Citation for this information:
Greg Jacobs. 2009. Ripistes parasita. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=2244> Revision Date: 8/4/2005
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