Aborted entoloma 
Abutilon theophrasti 
Acadian hermit crab 
Acanthocephala terminalis 
Acarospora fuscata 
Acilius mediatus 
Acorn Plum Gall Wasp 
Acorn weevil 
Acrobasis caryalbella 
Acronicta clarescens 
Acronicta lobeliae 
Addison's Leather Flower 
Aedes japonicus 
African bush elephant 
Agaricus vinosobrunneofumidus 
Agreeable tiger moth 
Agrocybe erebia 
Agrocybe praecox 
Ailanthus webworm 
Akanthomyces aranearum 
Albugo candida 
Alder spittlebug 
Aleurodiscus disciformis 
Allegheny blackberry
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