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| NAS - Nonindigenous Aquatic Species |
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Common Name: a tubificid worm
Taxonomy: available through 
Identification: Dorsal hair chaetae are absent. Dorsal needles begin on segment 5. There are 2 to 4 ventral chaetae on segment 2 and usually 1 or 2 on the rest. All of the anterior ventral chaetae have the upper tooth about twice as long as the lower tooth. When mature there are 2 or 3 penial chaetae on segment 5, which are thickened, but not as modified as Paranais litoralis. There are no eyes. Coelomocytes are present. The body wall non-papillate, but has transverse furrows, which may hold a thin layer of foreign matter. (Gustafson 1996)
Size: Up to 9 mm.
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Hawaii |
Caribbean |
Interactive maps: Continental US, Alaska, Hawaii, Caribbean
Nonindigenous Occurrences: Established in San Fransisco Bay, California (Ruiz, 2000).
Ecology: Brackish water. (Carlton 2007) Benthic deposit feeders.
Means of Introduction:
Status:
Impact of Introduction: Community dominance. (Cohen 1995)
Remarks:
References
Carlton, James T. 2007. Intertidal Invertebrates from Central California to Oregon :1001
Cohen, A.N. and J.T. Carlton. 1995. Nonindigenous Aquatic Species in a United States Estuary, A Case Study of the Biological Invasions of the San Francisco Bay and Delta. Report for USFWS, WA DC, and Connecticut Sea Grant. :246 pp.
Gustafson, D. L. 2006 (http://www.esg.montana.edu/aim/annelid/parfri.html)
Ruiz, G. M., P. W. Fofonoff, J. T. Carlton, M. J. Wonham, and A. H. Hines 2000. Invasion of coastal marine communities in North America: Apparent patterns, processes, and biases Annual Review of Ecological Systematics. 31:481-531
Author: Nancy Elder
Revision Date: 2/23/2009 Citation for this information:
Nancy Elder. 2009. Paranais frici. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=1150> Revision Date: 2/23/2009
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