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4,118 species in Yellowstone National Park
Andrena cyanophila
Andrena melanochroa
Andrena scutellinitens
Andrena sola
Andrena topazana
Anoplius imbellis
Antennaria alpina
Antennaria aromatica
Antennaria pulcherrima
Anthaxia inornata
Antheraea polyphemus
Anthidium clypeodentatum
Anthidium mormonum
Anthophora affabilis
Anthophora ursina
Apamea amputatrix
Apamea auranticolor
Aphis gutierrezis
Aphyllon ludovicianum
Aquilegia formosa
Orthosia hibisci
Brachythecium rutabulum
Araneus gemmoides
Araneus nordmanni
Arctia plantaginis
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