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the former north american ("s. a. antillarum") and red sea "s. a. saundersi" subspecies are now considered to be separate species, the least tern ("sternula antillarum") and saunders's tern ("sternula saundersi").
además dos variedades que inicialmente se consideraban subespecies del charrancito ("s. a. antillarum" y "s. a. saundersi") actualmente se consideran especies separadas, el charrancito americano ("sternula antillarum") y el charrancito de saunders ("sternula saundersi").