family Acrididae family Actinidiaceae family Actinomycetaceae family Adelgidae family Adiantaceae family Aegypiidae family Aepyornidae family Agamidae family Agaricaceae family Agavaceae family Agonidae family Ailuropodidae family Aizoaceae family Akeridae family Alaudidae family Albuginaceae family Albulidae family Alcedinidae family Alcidae family Aleyrodidae family Alismataceae family Alliaceae family Alligatoridae family Allioniaceae family Aloeaceae family Alopiidae family Alstroemeriaceae family Amaranthaceae family Amaryllidaceae family Ambrosiaceae family Ambystomatidae family Ameiuridae family Amiidae family Ammodytidae family Amphioxidae family Amphisbaenidae family Amphiumidae family Amygdalaceae family Anabantidae family Anacardiaceae
| family Anarhichadidae family Anatidae family Ancylidae family Ancylostomatidae family Andrenidae family Anguidae family Anguillidae family Anhimidae family Anhingidae family Anniellidae family Annonaceae family Anobiidae family Anomalopidae family Anomiidae family Antedonidae family Antennariidae family Anthocerotaceae family Antilocapridae family Aphididae family Aphyllanthaceae family Apiaceae family Apidae family Aplodontiidae family Aplysiidae family Apocynaceae family Apodidae family Apogonidae family Apterygidae family Aquifoliaceae family Araceae family Araliaceae family Araucariaceae family Arcellidae family Arcidae family Arctiidae family Ardeidae family Arecaceae family Argasidae family Argentinidae family Argiopidae
| family Argonautidae family Ariidae family Aristolochiaceae family Armadillidiidae family Artamidae family Ascaphidae family Ascaridae family Asclepiadaceae family Asilidae family Asparagaceae family Aspergillaceae family Asphodelaceae family Aspleniaceae family Astacidae family Asteraceae family Atherinidae family Athiorhodaceae family Athyriaceae family Atrichornithidae family Atropidae family Aulostomidae family Auriculariaceae family Avicenniaceae family Azollaceae family Babesiidae family Bacillaceae family Bacteroidaceae family Balaenicipitidae family Balaenidae family Balaenopteridae family Balanidae family Balistidae family Balsaminaceae family Bangiaceae family Bathyergidae family Batidaceae family Batrachoididae family Begoniaceae family Belemnitidae family Belonidae
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