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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Superordo: Caprimulgimorphae
Ordo: Apodiformes

Familia: Trochilidae
Subfamilia: Trochilinae
Genus: Stephanoxis
Species: S. lalandi – S. loddigesii
Name

Stephanoxis Simon, 1897
References

Catalogue des especes actuellment connues de la famille de trochilides p.40
Cavarzere, V., Silveira, L.F., Vasconcelos, M.F., Grantsau, R. & Straube, F.C.. 2014. Taxonomy and biogeography of Stephanoxis Simon, 1897 (Aves: Trochilidae). Papéis Avulsos de Zoologia 54: 69–79. Full article view. DOI: 10.1590/0031-1049.2014.54.07 Reference page.

The two plovercrests comprise the genus Stephanoxis. They were formerly considered conspecific under the name "black-breasted plovercrest".
Species

The SACC accepted both as distinct species in 2015. The two species are:[1]
Image Scientific name Common Name Distribution
Beija-flor-de-topete.jpg Stephanoxis lalandi Green-crowned plovercrest Brazil
Stephanoxis lalandi (cropped).jpg Stephanoxis loddigesii Purple-crowned plovercrest Argentina, Brazil, and Paraguay
References

Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2020). "Hummingbirds". IOC World Bird List Version 10.2. International Ornithologists' Union. Retrieved 5 January 2020.

South American Classification Committee (May 1, 2015). "Proposal (#664) to South American Classification Committee – Treat Stephanoxis lalandi as consisting of two species". Retrieved July 25, 2015.

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