. "Laridae" . . . "Larus schistisagus Stejneger 1884" . "Larus schistisagus" . "Slaty-backed Gull" . "Stejneger 1884" . . "Chordata" . . "Animalia" . . . . . "Aves" . . . . "Charadriiformes" . . . . "Larus" . . .