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                | sample publication 
   |  | Entrez Taxonomy 
 
    
        | Necturus maculosus, the common mudpuppy, is an entirely aquatic
            salamander which undergoes paedomorphosis and retains its external
            gills.  It is found in eastern North America, generally in the Great
            Lakes region and in the tributary lands to the St. Lawrence, 
            Mississippi, and Ohio rivers. |   |  |  |