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 Major Groups

 
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6(2). Partially or almost totally covered by a hard, inflexible shell (S) or shells; single muscular foot (F)    Mollusca
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Gastropoda 

muscular foot, single shell

Gastropoda  

Bivalvia 

2 hinged shells

 Bivalvia 

-Without a shell or single muscular foot
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Diptera 

Insecta - larva

Diptera 

Insecta - pupa

Syllidae 

Polychaeta

Lumbriculidae 

Oligochaeta

Tricladia 

Platyhelminthes

Tetrastematidae 

Nemertea

Mermithidae 

Nematoda

Gordioidea 

Nematomorpha

Hydrozoa 

Cnidaria

Hydrozoa 

Cnidaria

Hydrozoa 

Cnidaria

 

Bryozoa

Aelosomatidae 

Aphanoneura

Hirudinidae 

Hirudinea

Spongillidae 

Porifera

Hydrozoa 

Cnidaria - hydroid