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  Animalia
      Arthropoda
            Insecta
                    Hymenoptera
                      Apocrita
                        Aculeata
                          Apoidea
                                 [Sphecoidea]
                            Megachilidae
                                     Anthidiellum
                                             Anthidiellum robertsoni
                                               Anthidiellum robertsoni ssp. citrinellum
                                     Anthidium
                                             Anthidium angulatum
                                             Anthidium brachyurum
                                             Anthidium divisum
                                               Anthidium divisum ssp. nanulum
                                               Anthidium divisum ssp. ornatifrons
                                             Anthidium flavicaudum
                                             Anthidium fontis
                                             Anthidium fresnoense
                                             Anthidium funereum
                                             Anthidium hamatum
                                             Anthidium lucidum
                                             Anthidium pallidiclypeum
                                             Anthidium palliventre
                                               Anthidium palliventre ssp. vanduzeei
                                             Anthidium permaculatum
                                             Anthidium plumarium
                                             Anthidium puncticaudum
                                             Anthidium ruizi
                                             Anthidium sculleni
                                             Anthidium sonorense
                                               Anthidium sonorense ssp. productum
                                             Anthidium spinosum
                                             Anthidium wallisi
                                               Anthidium wallisi ssp. wallowana
                                             Anthidium xanthognathum
                                     Anthocopa
                                             Anthocopa anthodyta
                                             Anthocopa arizonensis
                                             Anthocopa hebitis
                                             Anthocopa hypostomalis
                                             Anthocopa laevibullata
                                             Anthocopa mallognatha
                                             Anthocopa namatophila
                                             Anthocopa nigrior
                                             Anthocopa nitidivitta
                                             Anthocopa oregona
                                             Anthocopa panamintensis
                                             Anthocopa pycnognatha
                                               Anthocopa pycnognatha ssp. solatus
                                             Anthocopa triodonta
                                               Anthocopa triodonta ssp. usingeri
                                     Ashmeadiella
                                             Ashmeadiella aridula
                                             Ashmeadiella breviceps
                                             Ashmeadiella cactorum
                                               Ashmeadiella cactorum ssp. astragali
                                             Ashmeadiella californica
                                               Ashmeadiella californica ssp. sierraensis
                                             Ashmeadiella cazieri
                                             Ashmeadiella clypeodentata
                                             Ashmeadiella crassa
                                             Ashmeadiella difugita
                                               Ashmeadiella difugita ssp. emarginatula
                                             Ashmeadiella digiticauda
                                             Ashmeadiella erema
                                             Ashmeadiella eurynorhyncha
                                             Ashmeadiella florissantensis
                                             Ashmeadiella foveata
                                             Ashmeadiella foxiella
                                             Ashmeadiella gillettei
                                               Ashmeadiella gillettei ssp. cismontanica
                                             Ashmeadiella haematopoda
                                             Ashmeadiella inyoensis
                                             Ashmeadiella leachi
                                             Ashmeadiella leucozona
                                             Ashmeadiella micheneri
                                             Ashmeadiella microsoma
                                             Ashmeadiella occipitalis
                                             Ashmeadiella parkinsoniae
                                             Ashmeadiella rhodognatha
                                             Ashmeadiella rhodopus
                                             Ashmeadiella rufitarsis
                                             Ashmeadiella rufiventris
                                             Ashmeadiella salviae
                                             Ashmeadiella sculleni
                                             Ashmeadiella sonora
                                             Ashmeadiella stenognatha
                                             Ashmeadiella subangusta
                                             Ashmeadiella timberlakei
                                               Ashmeadiella timberlakei ssp. solida
                                             Ashmeadiella titusi
                                             Ashmeadiella vandykiella
                                             Ashmeadiella wislizeni
                                             Ashmeadiella xenomastax
                                     Callanthidium
                                             Callanthidium formosum
                                               Callanthidium formosum ssp. pratense
                                     Chelostoma
                                             Chelostoma bernardinum
                                             Chelostoma jacintanum
                                             Chelostoma minutum
                                               Chelostoma minutum ssp. cockerelli
                                               Chelostoma minutum ssp. incisulum
                                               Chelostoma minutum ssp. marginatum
                                             Chelostoma phaceliae
                                             Chelostoma tetramerum
                                     Chelostomoides
                                             Chelostomoides pratti
                                     Chelostomopsis
                                             Chelostomopsis australis
                                               Chelostomopsis australis ssp. nanus
                                     Chelynia
                                             Chelynia chlorocyanea
                                             Chelynia fragariella
                                             Chelynia franciscana
                                             Chelynia holocyanea
                                             Chelynia leucotricha
                                             Chelynia nitidula
                                             Chelynia subglauca
                                     Coelioxys
                                             Coelioxys asclepiadis
                                             Coelioxys gonaspis
                                             Coelioxys hypodonta
                                             Coelioxys mediata
                                             Coelioxys rufitarsis
                                               Coelioxys rufitarsis ssp. claripes
                                             Coelioxys salinaria
                                             Coelioxys tiburonensis
                                     Dianthidium
                                             Dianthidium consimile
                                               Dianthidium consimile ssp. mccrackenae
                                             Dianthidium desertorum
                                             Dianthidium discors
                                             Dianthidium dubium
                                               Dianthidium dubium ssp. dilectum
                                             Dianthidium fraternum
                                               Dianthidium fraternum ssp. hirtulum
                                             Dianthidium heterulkei
                                               Dianthidium heterulkei ssp. cornucopiana
                                             Dianthidium implicatum
                                             Dianthidium macswaini
                                             Dianthidium marshi
                                             Dianthidium parkeri
                                             Dianthidium parvum
                                               Dianthidium parvum ssp. baculifrons
                                               Dianthidium parvum ssp. basingeri
                                               Dianthidium parvum ssp. schwarzi
                                               Dianthidium parvum ssp. swenki
                                             Dianthidium platyurum
                                               Dianthidium platyurum ssp. mohavense
                                             Dianthidium plenum
                                               Dianthidium plenum ssp. australe
                                               Dianthidium plenum ssp. williamsi
                                             Dianthidium profugum
                                             Dianthidium pudicum
                                               Dianthidium pudicum ssp. decorum
                                               Dianthidium pudicum ssp. inyoense
                                               Dianthidium pudicum ssp. peninsulare
                                             Dianthidium rossi
                                             Dianthidium singulare
                                               Dianthidium singulare ssp. melanognathum
                                             Dianthidium subrufulum
                                             Dianthidium ulkei
                                               Dianthidium ulkei ssp. reductum
                                               Dianthidium ulkei ssp. riparii
                                     Dioxys
                                             Dioxys catalinensis
                                             Dioxys pacificus
                                               Dioxys pacificus ssp. melanogaster
                                             Dioxys phaceliae
                                             Dioxys pomonae
                                               Dioxys pomonae ssp. timberlakei
                                             Dioxys productus
                                               Dioxys productus ssp. cismontanicus
                                             Dioxys rohweri
                                     Heriades
                                             Heriades cressoni
                                             Heriades micheneri
                                             Heriades occidentalis
                                             Heriades sauteri
                                               Heriades sauteri ssp. philippinensis
                                             Heriades timberlakei
                                     Heteranthidium
                                             Heteranthidium subtimberlakei
                                             Heteranthidium timberlakei
                                     Heterostelis
                                             Heterostelis hurdi
                                             Heterostelis texana
                                     Hoplitis
                                             Hoplitis hicksi
                                             Hoplitis mojavensis
                                             Hoplitis perissocera
                                             Hoplitis producta
                                               Hoplitis producta ssp. bernardina
                                             Hoplitis rufina
                                     Lithurgus
                                             Lithurgus arizonensis
                                             Lithurgus oblongus
                                             Lithurgus socorroensis
                                     Megachile
                                             Megachile adelphodonta
                                             Megachile adesmiae
                                             Megachile albiscopa
                                             Megachile andalgalensis
                                             Megachile anograe
                                             Megachile arnaudi
                                             Megachile asterae
                                             Megachile astragali
                                             Megachile austrargentina
                                             Megachile balastensis
                                             Megachile belenensis
                                             Megachile bishoppi
                                             Megachile blaisdelli
                                             Megachile boharti
                                             Megachile brachysoma
                                             Megachile brevis
                                               Megachile brevis onobrychidis
                                                     [Megachile onobrychidis]
                                             Megachile cachiensis
                                             Megachile capillitensis
                                             Megachile chilopsidis
                                             Megachile chorillensis
                                             Megachile cleomis
                                               Megachile cleomis ssp. lippiae
                                             Megachile deuterochoniae
                                             Megachile discorhina
                                             Megachile disparipennis
                                             Megachile estebana
                                             Megachile frugalis
                                               Megachile frugalis ssp. pseudofrugalis
                                             Megachile infernillensis
                                             Megachile inyoensis
                                             Megachile justiciae
                                             Megachile leucographoides
                                             Megachile lobatifrons
                                             Megachile melanderi
                                             Megachile melanophaea
                                               Megachile melanophaea ssp. submelanophaea
                                             Megachile mojavensis
                                             Megachile neffi
                                             Megachile nigrargentina
                                             Megachile nigrinquirenda
                                             Megachile nigroludens
                                             Megachile occidentalis
                                               Megachile occidentalis ssp. leucotricha
                                             Megachile odontostoma
                                             Megachile opuntiarum
                                             Megachile palmensis
                                             Megachile pastizalensis
                                             Megachile patlincolni
                                             Megachile piliceps
                                             Megachile populi
                                             Megachile prosopidis
                                               Megachile prosopidis ssp. testudinis
                                             Megachile puertolobensis
                                             Megachile raveni
                                             Megachile remotissima
                                             Megachile rossi
                                             Megachile rubripennis
                                             Megachile santiamensis
                                             Megachile seducta
                                             Megachile semiexilis
                                             Megachile seychellensis
                                             Megachile sidalceae
                                             Megachile slevini
                                             Megachile soledadensis
                                             Megachile sonorana
                                             Megachile subfortis
                                             Megachile subparallela
                                             Megachile tiburonensis
                                             Megachile tilcarensis
                                             Megachile townsendiana
                                             Megachile valdizensis
                                             Megachile vanduzeei
                                             Megachile vandykei
                                             Megachile verbesinae
                                             Megachile yumensis
                              Megachilinae
                                Anthidiini
                                     Afranthidium
                                             Afranthidium abdominale
                                             Afranthidium capicola
                                             Afranthidium folliculosum
                                             Afranthidium malacopygum
                                     Pseudoanthidium
                                             Pseudoanthidium braunsi
                                                   [Afranthidium braunsi]
                                             Pseudoanthidium junodi
                                                   [Afranthidium junodi]
                                             Pseudoanthidium repetitum
                                                   [Afranthidium repetitum]
                                Dioxyini
                                     Aglaoapis
                                             Aglaoapis tridentata
                                     Osmia
                                             Osmia abdominalis
                                             Osmia albolateralis
                                             Osmia albomarginata
                                             Osmia alta
                                             Osmia angustipes
                                             Osmia aprilina
                                             Osmia arefacta
                                             Osmia caulicola
                                             Osmia celsa
                                             Osmia coloradella
                                             Osmia copelandica
                                             Osmia cyanopoda
                                             Osmia enceliae
                                             Osmia enixa
                                             Osmia erythrotricha
                                             Osmia exilis
                                             Osmia femorata
                                             Osmia francisconis
                                             Osmia gabrielis
                                             Osmia giffardi
                                             Osmia globosiformis
                                             Osmia gracilis
                                             Osmia hemizoniae
                                             Osmia hesperella
                                             Osmia hypochrysea
                                               Osmia hypochrysea ssp. rohweri
                                             Osmia hypocrita
                                             Osmia kerminesina
                                             Osmia laeta
                                             Osmia latisulcata
                                             Osmia liogastra
                                             Osmia lyncis
                                             Osmia marginata
                                             Osmia melanotricha
                                             Osmia mixta
                                             Osmia nelsoni
                                             Osmia nemoris
                                             Osmia occidentalis
                                             Osmia palmarum
                                             Osmia paradisica
                                             Osmia pellax
                                             Osmia pentstemonis
                                             Osmia peridonea
                                             Osmia phaceliarum
                                             Osmia pingreeana
                                             Osmia potentillae
                                             Osmia proposita
                                             Osmia punctata
                                             Osmia robustula
                                             Osmia rostrata
                                             Osmia rupestris
                                             Osmia seclusa
                                             Osmia sedula
                                             Osmia sequoiae
                                             Osmia shastensis
                                             Osmia solitaria
                                             Osmia theta
                                             Osmia timberlakei
                                             Osmia tokopahensis
                                             Osmia triodonta
                                             Osmia vana
                                             Osmia vanduzeei
                                             Osmia vandykei
                                             Osmia viguierae
                                               Osmia viguierae ssp. mortua
                                             Osmia visenda
                                             Osmia wardiana
                                               Osmia wardiana ssp. austromontana
                                             Osmia wheeleri
                                             Osmia xerophila
                              Megachiline
                                Megachilini
                                     Othinosmia
                                             Othinosmia stupenda
                                     Paranthidium
                                             Paranthidium sonorum
                                     Proteriades
                                             Proteriades basingeri
                                             Proteriades boharti
                                             Proteriades cryptanthae
                                             Proteriades deserticola
                                             Proteriades emarginatus
                                             Proteriades evansi
                                             Proteriades incanescens
                                               Proteriades incanescens ssp. nevadensis
                                             Proteriades nanula
                                             Proteriades nigra
                                             Proteriades nigrella
                                             Proteriades pygmaea
                                             Proteriades reducta
                                             Proteriades seminigra
                                               Proteriades seminigra ssp. yosemitensis
                                             Proteriades similis
                                             Proteriades tristis
                                     Pycnanthidium
                                             Pycnanthidium solomonis
                                     Raphidostoma
                                             Raphidostoma ceanothi
                                     Robertsonella
                                             Robertsonella crataegina
                                             Robertsonella dolichosoma
                                     Rozenia
                                             Rozenia jerryi
                                     Titusella
                                             Titusella clypeata
                                     Trachusa
                                             Trachusa catinula
                                             Trachusa gummifera
                                     Trichothurgus
                                             Trichothurgus piedrabuenae