The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Pectinatella magnifica
Pectinatella magnifica
(magnificent bryozoan)
Native Transplant
Translate this page with Google
Français Deutsch Español Português Russian Italiano Japanese

Copyright Info
Pectinatella magnifica (Leidy, 1851)

Common name: magnificent bryozoan

Taxonomy: available through www.itis.govITIS logo

Identification: Sessile, colonial organism with ciliated tentacles attached to a large gelatinous mass (Pennak 1989; Wood 2010). 

Native Range: P. magnifica was once restricted to warm freshwater systems east of the Mississippi, but now appears to be well established across North America (Pennak 1989; Wood 2010). 

US auto-generated map Legend USGS Logo
Alaska auto-generated map
Hawaii auto-generated map
Caribbean auto-generated map
Puerto Rico &
Virgin Islands
Guam auto-generated map
Guam Saipan
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Pectinatella magnifica are found here.

StateYear of earliest observationYear of last observationTotal HUCs with observations†HUCs with observations†
Arkansas201320131Petit Jean
California201320177Lower Sacramento; Mad-Redwood; North Fork American; Russian; Upper Mokelumne; Upper Stanislaus; Upper Tuolumne
Idaho199820174Coeur d'Alene Lake; North Fork Payette; Pend Oreille Lake; Upper Spokane
Louisiana201720171Lake Maurepas
Oregon1998201714Alsea; Clackamas; Coast Fork Willamette; Coos; Lower Columbia-Clatskanie; Lower Willamette; Middle Columbia-Hood; Middle Willamette; Necanicum; Siletz-Yaquina; Tualatin; Upper Klamath; Upper Klamath Lake; Wilson-Trusk-Nestuccu
Texas200720173Leon; Middle Brazos-Palo Pinto; West Fork San Jacinto
Washington1998201716Banks Lake; Colville; Crescent-Hoko; Duwamish; Hoh-Quillayute; Lake Washington; Lower Columbia-Clatskanie; Lower Columbia-Sandy; Lower Cowlitz; Lower Skagit; Nooksack; Puget Sound; Queets-Quinault; Strait of Georgia; Upper Chehalis; Upper Columbia-Priest Rapids
Wisconsin201620161La Crosse-Pine

Table last updated 5/25/2018

† Populations may not be currently present.

Ecology: Found in freshwater lakes and rivers (Wood 2010).

Means of Introduction: Unknown

Status: <p> Unknown</p>

Impact of Introduction: <p> They have been known to clog water pipes (Wood 2010).</p>

Remarks: <p> This species may be cryptogenic in western states, few early surveys were conducted.&nbsp;</p>

References: (click for full references)

<p> Marsh, T., and T. S. Wood. 2002. Results of a freshwater bryozoan survey in the Pacific Northwestern United States, Pages 207-214 in Bryozoan Studies 2001, Wyse Jackson, D. P., C. J. Buttler, and M. S. Jones, eds., Balkema Publishers, Rotterdam, Netherlands.</p> <p> Neck, R. and R. Fullington. 1983. New records of the freshwater ectoproct P<span style="font-style: italic;">ectinatella magnifica</span> in eastern Texas. Texas J. Sci. 35:269-271.<br /> <br /> Pennak, R. W. 1989.&nbsp; Fresh-water Invertebrates of the United States, 3rd Ed., John Wiley and Sons, New York, 628 pp.<br /> <br /> Wood, T. S.&nbsp; Bryozoans.&nbsp; <u>Pages</u> 437-454 <em>in</em> Thorp, J. H. and A. P. Covich (eds.), 2010. Ecology and Classification of North American Freshwater Invertebrates.&nbsp; Academic Press, Inc., San Diego, CA, 1021 pp.</p>

Other Resources:
<p> <em><a href="http://www.bio.umass.edu/biology/conn.river/bryozoa.html">Pectinatella magnifica in the Connecticut River</a></em></p>

Author: Benson, A.J., and M. Cannister

Revision Date: 9/16/2013

Citation Information:
Benson, A.J., and M. Cannister, 2018, Pectinatella magnifica (Leidy, 1851): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=2335, Revision Date: 9/16/2013, Access Date: 6/24/2018

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logoU.S. Department of the Interior | U.S. Geological Survey
URL: https://nas.er.usgs.gov
Page Contact Information: Pam Fuller - NAS Program (pfuller@usgs.gov)
Page Last Modified: Wednesday, May 23, 2018


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/24/2018].

Additional information for authors