The marvelous spatuletail (Loddigesia mirabilis) is an endangered species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae.

[3][4][1] The marvelous spatuletail is currently (early 2022) treated by worldwide taxonomic systems as the only member of its genus.

[3][4][5] However, a molecular phylogenetic study of the hummingbirds published in 2014 found that the marvelous spatuletail was embedded in genus Eriocnemis, the "pufflegs".

The male's signature feature is its two outer tail feathers with bare shafts that cross each other and end in large purplish black racquets or "spatules".

[8] The marvelous spatuletail forages by trap-lining, visiting a circuit of flowering plants where it perches to feed.

The male marvelous spatuletail gives "a repeated high-pitched buzzy metallic note...'tzzz...tzzz...'" during its aerial display.

Deforestation is rampant in its range though the species' preference for edge and scrubby habitats may somewhat ameliorate its effects.