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COSEWIC assessment and update status on the round hickorynut Obovaria subrotunda in Canada - 2003

Special Significance of the Species

There are six recognized species in the genus Obovaria; only the hickorynut (O. olivaria) and round hickorynut (O. subrotunda) have ranges extending into Canada. One of the six species, the ring pink (O. retusa), is listed as federally endangered in the United States (U.S. Fish and Wildlife Service 2002). The American Fisheries Society (AFS) also recognizes the round ebonyshell (O. rotulata) as endangered (Williams et al. 1993). Three other species, the southern hickorynut (O. jacksoniana), Alabama hickorynut (O. unicolor) and round hickorynut (O. subrotunda) are listed as special concern (a species or subspecies that may become endangered or threatened by relatively minor disturbances to its habitat, and deserves careful monitoring of its abundance and distribution) by the AFS; only the hickorynut (O. olivaria) is considered to be stable.