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Four subspecies are recognized, fannyi, subtropicalis, verticeps, and hypochlora. The last one is sometimes considered a full species, Emerald-bellied Woodnymph (Thalurania hypochlora). Green-crowned Woodnymph has in the past been considered part of Crowned Woodnymph. A SACC proposal passed in 2013 relumps Green-crowned Woodnymph into Violet-crowned Woodnymph.
A recently described form, Thalurania nigricapilla has been recommended against recognition by SACC because there is a feeling it might be a variant of one of the above subspecies.
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