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 Major Groups

 
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1. Animals visible to the unaided eye; small to large, >0.5 mm
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Insecta - adult 

Insecta - nymph 

Insecta - larva 

Insecta - pupa 

Crustacea 

Crustacea 

Gastropoda 

Bivalvia 

Cnidaria 

Bryozoa 

Porifera 

Collembola 

Hirudinea 

Oligochaeta 

Polychaeta 

Nemertea 

Acarina 

Platyhelminthes 

Nematoda 

Nematomorpha 

Aphanoneura 

-Animals not visible to the unaided eye; very small, <0.5 mm
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Protozoa 

Gastrotrichia 

Rotifera 

Tardigrada