ordo Abrothallales - Dothideomycetes
ordo Acanthobdellida - Clitellata
ordo Acanthoecida - Choanoflagellatea
ordo Acanthopleuribacterales - Holophagae
ordo Acarosporales - Lecanoromycetes
ordo Accipitriformes - Aves
ordo Acholeplasmatales - Tenericutes
ordo Acidilobales - Thermoprotei
ordo Acidimicrobiales - Actinobacteria
ordo Acidithiobacillales - Gammaproteobacteria
ordo Acidobacteriales - Acidobacteria
ordo Acipenseriformes - Actinopterygii
ordo Acoela - Xenacoelomorpha
ordo Aconchulinida - Filosa
ordo Acorales - Liliopsida
ordo Acritarcha ordo incertae sedis - Acritarcha classis incertae sedis
ordo Acrochaetiales - Florideophyceae
ordo Acroglissida - Peranemea
ordo Acrospermales - Dothideomycetes
ordo Acrosymphytales - Florideophyceae
ordo Actiniaria - Anthozoa
ordo Actinomycetales - Actinobacteria
ordo Actinulida - Hydrozoa
ordo Adapedonta - Bivalvia
ordo Aeromonadales - Gammaproteobacteria
ordo Afrosoricida - Mammalia
ordo Agaricales - Agaricomycetes
ordo Agaricostilbales - Agaricostilbomycetes
ordo Agelasida - Demospongiae
ordo Agyriales - Lecanoromycetes
ordo Ahnfeltiales - Florideophyceae
ordo Akentrogonida - Maxillopoda
ordo Albuliformes - Actinopterygii
ordo Alcyonacea - Anthozoa
ordo Alismatales - Liliopsida
ordo Alteromonadales - Gammaproteobacteria
ordo Amblypygi - Arachnida
ordo Amborellales - Magnoliopsida
ordo Amiiformes - Actinopterygii
ordo Amphidiniales - Dinophyceae
ordo Amphidiscosida - Hexactinellida
ordo Amphilepidida - Ophiuroidea
ordo Amphilinidea - Cestoda
ordo Amphinomida - Polychaeta
ordo Amphionidacea - Malacostraca
ordo Amphipoda - Malacostraca
ordo Amphisphaeriales - Sordariomycetes
ordo Amplistromatales - Sordariomycetes
ordo Amylocorticiales - Agaricomycetes
ordo Anaerolineales - Anaerolineae
ordo Anaeroplasmatales - Tenericutes
ordo Anaspidacea - Malacostraca
ordo Anaulales - Mediophyceae
ordo Anguilliformes - Actinopterygii
ordo Anisonemida - Peranemea
ordo Annulatascales - Sordariomycetes
ordo Anostraca - Branchiopoda
ordo Anseriformes - Aves
ordo Anthoathecata - Hydrozoa
ordo Antipatharia - Anthozoa
ordo Anura - Amphibia
ordo Aphelenchida - Secernentea
ordo Aphragmophora - Sagittoidea
ordo Apiales - Magnoliopsida
ordo Aplousobranchia - Ascidiacea
ordo Aplysiida - Gastropoda
ordo Apochela - Eutardigrada
ordo Apodida - Holothuroidea
ordo Apodiformes - Aves
ordo Apoikiales - Chrysophyceae
ordo Apororhynchida - Archiacanthocephala
ordo Apterygiformes - Aves
ordo Apusomonadida - Apusomonadea
ordo Apygophora - Maxillopoda
ordo Aquificales - Aquificae
ordo Aquifoliales - Magnoliopsida
ordo Arachnomycetales - Eurotiomycetes
ordo Araeolaimida - Adenophorea
ordo Araneae - Arachnida
ordo Arbacioida - Echinoidea
ordo Arcanodiscales - Coscinodiscophyceae
ordo Archaegladiopsidales - Coscinodiscophyceae
ordo Archaeoglobales - Archaeoglobi
ordo Archaeognatha - Insecta
ordo Archaeorhizomycetales - Archaeorhizomycetes
ordo Archaeosporales - Glomeromycetes
ordo Architaenioglossa - Gastropoda
ordo Arcida - Bivalvia
ordo Arecales - Liliopsida
ordo Arguloida - Maxillopoda
ordo Arhynchobdellida - Clitellata
ordo Arkhangelskiales - Coccolithophyceae
ordo Armatimonadales - Armatimonadia
ordo Arthoniales - Arthoniomycetes
ordo Arthrotardigrada - Heterotardigrada
ordo Artiodactyla - Mammalia
ordo Ascaridida - Secernentea
ordo Ascoseirales - Phaeophyceae
ordo Ascosphaerales - Eurotiomycetes
ordo Asellariales - Zygomycota
ordo Asparagales - Liliopsida
ordo Aspidodiadematoida - Echinoidea
ordo Aspidogastrida - Trematoda
ordo Aspidosiphoniformes - Phascolosomatidea
ordo Asterales - Magnoliopsida
ordo Asterinales - Dothideomycetes
ordo Asterocladales - Phaeophyceae
ordo Asterolamprales - Coscinodiscophyceae
ordo Asterotexales - Dothideomycetes
ordo Astigmata - Arachnida
ordo Astrorhizida - Polythalamea
ordo Ateleopodiformes - Actinopterygii
ordo Atheliales - Agaricomycetes
ordo Atheriniformes - Actinopterygii
ordo Atractiellales - Atractiellomycetes
ordo Atractophorales - Florideophyceae
ordo Aulacoseirales - Coscinodiscophyceae
ordo Aulopiformes - Actinopterygii
ordo Aurearenales - Phaeothamniophyceae
ordo Auriculariales - Agaricomycetes
ordo Austrobaileyales - Magnoliopsida

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