Common name: Allegheny Pearl Dace
available through www.itis.gov
Identification: Scott and Crossman (1973), Becker (1983), Smith (1985), Page and Burr (1991); another name is Semotilus margarita. Two subspecies are currently recognized, M. m. margarita in the Allegheny region, and M. m. nachtriebi in the rest of the range (Page and Burr 1991).
Size: 16 cm.
Native Range: Atlantic, Hudson Bay, Great Lakes, and Mississippi River basins in southern Canada and northern United States from Atlantic Coast to southern Northern Territories, eastern British Columbia, and Montana; south to Virginia, Michigan, Wisconsin, and Iowa. Isolated population in upper Missouri River basin, South Dakota, Nebraska, and Wyoming (Page and Burr 1991).
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 Margariscus margarita are found here.
Table last updated 2/27/2023
† Populations may not be currently present.
Means of Introduction: Unknown. Possible bait bucket release.
Status: Reported from Connecticut. The Byram River drainage was sampled in 1987 and 1988 but no additional specimens were found. Consequently, Whitworth (1996) concluded that the species was no longer present.
Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.
Pam Fuller, and Leo Nico
Revision Date: 3/22/2000
Peer Review Date: 3/22/2000
Pam Fuller, and Leo Nico, 2023, Margariscus margarita (Cope, 1867): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=569, Revision Date: 3/22/2000, Peer Review Date: 3/22/2000, Access Date: 3/22/2023
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.