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- Arcto-Tertiary Geoflora
- Arctoa
- Arctobius
- Arctobyrrhus
- Arctobyrrhus subcanus
- Arctocephalites
- Arctocephalus
- Arctocephalus forsteri
- Arctoceras
- Arctocetraria
- Arctoconopa
- Arctocorisa
- Arctocorisa carinata
- Arctocorisa germari
- Arctocyon
- Arctocyonia
- Arctocyonidae
- Arctodiamesa
- Arctodiaptomus
- Arctodiaptomus burduricus
- Arctodiaptomus euacanthus
- Arctodiaptomus kamtschaticus
- Arctodiaptomus michaeli
- Arctodus
- Arctogadus
- Arctogeron
- Arctognathus
- Arctogymnites
- Arctohungarites
- Arctohyalopoa
- Arctoidea
- Arctolamia
- Arctolamia fasciata
- Arctolamia fruhstorferi
- Arctolamia luteomaculata
- Arctolamia strandi
- Arctolamia villosa
- Arctolepis
- Arctomecon
- Arctomecon californica
- Arctomecon humilis
- Arctomecon merriamii
- Arctomeekoceras
- Arctomelon
- Arctomelon benthale
- Arctomelon stearnsii
- Arctomelon tamikoae
- Arctomercaticeras
- Arctometatarsal
- Arctomia
- Arctomia teretiuscula
- Arctomiaceae
- Arctomys Cave
- Arctomys Falls
- Arctomys Formation
- Arctomys Peak
- Arctonasua
- Arctonoe
- Arctonoe vittata
- Arctoparmelia
- Arctoparmelia centrifuga
- Arctoparmelia separata
- Arctopelopia
- Arctoperlaria
- Arctophila
- Arctophila (fly)
- Arctophila fulva
- Arctopora
- Arctoprionites
- Arctops
- Arctopsis
- Arctopsyche
- Arctopsyche grandis
- Arctopsyche ladogensis
- Arctopsychidae
- Arctoptychites
- Arctopus
- Arctornis
- Arctornis cygna
- Arctornis ecnomoda
- Arctornis egerina
- Arctornis fenestrata
- Arctornis jonasii
- Arctornis l-nigrum
- Arctornis submarginata
- Arctornis subvitrea
- Arctorthezia
- Arctosa
- Arctosa alpigena
- Arctosa cinerea
- Arctosa emertoni
- Arctosa excellens
- Arctosa figurata
- Arctosa fulvolineata
- Arctosa leopardus
- Arctosa littoralis
- Arctosa perita
- Arctosa raptor
- Arctosa rubicunda
- Arctosa sanctaerosae
- Arctosa similis
- Arctosa stigmosa
- Arctosa tbilisiensis
- Arctosa virgo
- Arctosaurus
- Arctoscelia
- Arctoscyphus
- Arctoseius
- Arctoseius austriacus
- Arctoseius babenkoi
- Arctoseius cetratus
- Arctoseius eremita
- Arctoseius euventralis
- Arctoseius kolymensis
- Arctoseius latoanalis
- Arctoseius memnon
- Arctoseius minutus
- Arctoseius miranalis
- Arctoseius nikolskyi
- Arctoseius productus
- Arctoseius semiscissus
- Arctoseius tschernovi
- Arctoseius venustulus
- Arctosippa
- Arctosirenites
- Arctosoma
- Arctosomma
- Arctosomus
- Arctostaphylos
- Arctostaphylos andersonii
- Arctostaphylos auriculata
- Arctostaphylos bakeri
- Arctostaphylos bolensis
- Arctostaphylos canescens
- Arctostaphylos catalinae
- Arctostaphylos columbiana
- Arctostaphylos confertiflora
- Arctostaphylos cruzensis
- Arctostaphylos densiflora
- Arctostaphylos edmundsii
- Arctostaphylos franciscana
- Arctostaphylos gabilanensis
- Arctostaphylos glandulosa
- Arctostaphylos glandulosa subsp. crassifolia
- Arctostaphylos glandulosa subsp. gabrielensis
- Arctostaphylos glauca
- Arctostaphylos glutinosa
- Arctostaphylos hispidula
- Arctostaphylos hookeri
- Arctostaphylos hooveri
- Arctostaphylos imbricata
- Arctostaphylos insularis
- Arctostaphylos klamathensis
- Arctostaphylos luciana
- Arctostaphylos malloryi
- Arctostaphylos manzanita
- Arctostaphylos manzanita subsp. elegans
- Arctostaphylos mewukka
- Arctostaphylos montana
- Arctostaphylos montaraensis
- Arctostaphylos montereyensis
- Arctostaphylos morroensis
- Arctostaphylos myrtifolia
- Arctostaphylos nevadensis
- Arctostaphylos nissenana
- Arctostaphylos nortensis
- Arctostaphylos nummularia
- Arctostaphylos nummularia subsp. mendocinoensis
- Arctostaphylos obispoensis
- Arctostaphylos ohloneana
- Arctostaphylos osoensis
- Arctostaphylos otayensis
- Arctostaphylos pacifica
- Arctostaphylos pajaroensis
- Arctostaphylos pallida
- Arctostaphylos parryana
- Arctostaphylos patula
- Arctostaphylos pechoensis
- Arctostaphylos pilosula
- Arctostaphylos pringlei
- Arctostaphylos pumila
- Arctostaphylos pungens
- Arctostaphylos purissima
- Arctostaphylos rainbowensis
- Arctostaphylos refugioensis
- Arctostaphylos regismontana
- Arctostaphylos rubra
- Arctostaphylos rudis
- Arctostaphylos silvicola
- Arctostaphylos stanfordiana
- Arctostaphylos tomentosa
- Arctostaphylos uva-ursi
- Arctostaphylos virgata