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.

Lophopodella carteri
Lophopodella carteri
(Asian freshwater bryozoan)

Copyright Info
Lophopodella carteri (Hyatt 1865)

Common name: Asian freshwater bryozoan

Synonyms and Other Names: Lophipus carteri, Pectinatella carteri

Taxonomy: available through www.itis.govITIS logo


L. carteri colonies are globular, lobate, and yellowish in color. They are usually not greater than 1.5 cm in diameter (Ricciardi and Reiswig 1994). The highest density of colonies was found to be 65 colonies/m2 by Ricciardi and Lewis (1991). Polypide number ranges from 20 to 70 per colony, and each polypide ranges from 1.08 mm to 1.52 mm (Bushnell 1965).

L. carteri statoblasts are identified by their spines with serrated edges which are confined to the margins at the poles; overall, the  statoblast is saddle-shaped and broadly oval in outline (Ricciardi and Reiswig, 1994)

Size: 1.08 mm to 1.52 mm per polypide

Native Range: Southeast Asia (Ricciardi and Reiswig 1994 and references, Bushnell 1965). Northeast Africa (Bushnell 1965).

Hydrologic Unit Codes (HUCs) Explained
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 Lophopodella carteri are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CO200820081Upper Arkansas
HI198719972Hawaii; Oahu
IN199519951Little Calumet-Galien
KY195719571Silver-Little Kentucky
MA198419841Ashuelot River-Connecticut River
MI195819972Kalamazoo; Manistee
OH193419341Lake Erie
OR199819983Coast Fork Willamette; Lost; Upper Klamath

Table last updated 4/12/2024

† Populations may not be currently present.

Ecology: L. carteri can reproduce both sexually and asexually in freshwater (Ricciardi and Reiswig, 1994). When reproducing asexually, L. carteri produces statoblasts which are resistant to freezing and desiccation and are able to produce new colonies after lying dormant for decades  (Kipp et al., 2010).

L. carteri prefer shallow alkaline waters and solid substrates; they experience the highest growth rate between 15 and 28 degrees Celsius (Walker et al., 2013).  They are able to survive temperatures between 4 and 32 C and pH between 7.4-9.4 (Ricciardi and Reiswig, 1994).

Means of Introduction: Lophopodella carteri is thought to have been introduced to North America with aquatic plants in the 1930s (Masters 1940). Rogick and Dahlgren independently found L. carteri in the U.S. in 1934 (Ricciardi and Lewis 1991). Lophopodella carteri was discovered in large quantities in a commercial greenhouse in Ohio in 1934, very near to the time it was found by Rogick on Lake Erie in Ohio (Masters 1940). That same company had other greenhouses in New Jersey, where L. carteri was sited by Dahlgren (Masters 1940). Possibly aquarium release in Hawaii (Devick 1991).

Bushnell (1965) found L. carteri in a waterfowl sanctuary and noted the strong possibility of statoblasts to be spread by waterfowl. Statoblasts have been found on the feet and bills of waterfowl, and have been known to remain viable after passing through the digestive tract of a mallard (Bushnell 1965).

Status: Established where recorded.

Impact of Introduction: Bryozoans, in general, can easily become an economic nuisance due to their encrusting colonies (Ricciardi and Reiswig 1994).  

The ecological impact of L. carteri has not yet been thoroughly investigated. Lauer et al. (1999) found that L. carteri colonies inhibit zebra mussels (Dreissena polymorpha) from settling. Lophopodella carteri also readily forms colonies on mollusk shells (Ricciardi and Reiswig 1994, Lauer et al. 1999), against which zebra mussels appear to have no defense (Lauer et al. 1999). Lauer et al. (1999) suggested three ways in which L. carteri could prevent recruitment of D. polmorpha: 1. There is a current produced by bryozoans lophophore cilia (used for food selection, waste rejection) that may physically prevent D. polymorpha larvae from settling. 2. The cover produced by L. carteri colonies may cause D. polymorpha larvae to seek alternate substrates. 3. The coelomic fluid of L. carteri is known to kill fish and salamanders by damaging gill tissue, and this fluid may also have a detrimental effect on D. polymorpha larvae.

Remarks: A colony of L. carteri can move up to 12 cm per day (Bushnell 1965).

References: (click for full references)

Bushnell, J.H. 1965. On the taxonomy and distribution of freshwater ectoprocta in Michigan. Part I. Transactions of the American Microscopical Society 84:231-244.

Bushnell, J.H. 1974. Bryozoans. Pages 157-194 in Hart, C.W. and S.L.H. Fuller, eds. Pollution ecology of freshwater invertebrates. Academic Press. New York, NY.

Devick, W.S. 1991. Patterns of introductions of aquatic organisms to Hawaiian freshwater habitats. Pages 189-213 in New Directions in Research, Management and Conservation of Hawaiian Freshwater Stream Ecosystem. Proceedings Freshwater Stream Biology and Fisheries Management Symposium. Hawaii Department of Land and Natural Resources.

GLMRIS. 2012. Appendix C: Inventory of Available Controls for Aquatic Nuisance Species of Concern, Chicago Area Waterway System. U.S. Army Corps of Engineers.

Lauer, T.E., D.K. Barnes, A. Ricciardi, and A. Spacie. 1999. Evidence of recruitment inhibition of zebra mussel (Dreissena polymorpha) by a freshwater bryozoan (Lophopodella carteri). Journal of the North American Benthological Society 18(3):406-413.

Masters, O.C. 1940. Notes on subtropical plants and animals in Ohio. Ohio Journal of Science 25:67-70.

Pardue, W.J. and T.S. Wood. 1980. Baseline toxicity data for freshwater bryozoa exposed to copper, cadmium, chromium, and zinc. Journal of the Tennessee Academy of Science 55(1):27-31.

Piola, Richard F., and Emma L. Johnston. "Differential Tolerance to Metals among Populations of the Introduced Bryozoan Bugula neritina." Marine Biology 148.5 (2006): 997-1010. Web.

Ricciardi, A., and H.M. Reiswig. 1994. Taxonomy, distribution, and ecology of the freshwater bryozoans (Ectoprocta) of eastern Canada. Canadian Journal of Zoology 72:339-359.

Ricciardi, A., and D.J. Lewis. 1991. Occurrence and ecology of Lophopodella carteri (Hyatt) and other freshwater Bryozoa in the lower Ottawa River near Montreal, Quebec. Canadian Journal of Zoology 69:1401-1404.

Rogick, M.D. 1957. Studies of the freshwater Bryozoa. XVIII. Lophopodella carteri in Kentucky. Transactions of the Kentucky Academy of Science 18:85-87.

Smith, D.G. 1985. Lophopodella carteri (Hyatt), Pottsiella erecta (Potts), and other freshwater ectoprocta in the Connecticut River (New England, U.S.A.). Ohio Journal of Science 85(1):67-70.

Tenney, W.R., and W.S. Woolcott. 1962. First report of the bryozoan, Lophopodella carteri (Hyatt) in Virginia. American Midland Naturalist 68:247-248.

United States. U.S. Army Corps of Engineers. Department of Defense. Inventory of Available Controls for Aquatic Nuisance Species of Concern, Chicago Area Waterway System. N.p.: Great Lakes and Mississippi Interbasin Study, 2011.

Other Resources:
Great Lakes Waterlife

Author: Fuller, P., E. Maynard, J. Larson, T.H. Makled, and A. Fusaro

Revision Date: 9/12/2019

Citation Information:
Fuller, P., E. Maynard, J. Larson, T.H. Makled, and A. Fusaro, 2024, Lophopodella carteri (Hyatt 1865): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=278, Revision Date: 9/12/2019, Access Date: 4/12/2024

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.


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. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [4/12/2024].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.