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Tylodinoidea
The order Tylodinoidea includes species with large, external cap-shaped shells and plume-like gills located between the mantel and foot on the left side. They are nocturnal sponge feeders. The order was formerly included with the Pleurobranchomorpha in the order Notaspidea. There are two families known from Hawaii.


Tylodinidae

Umbraculidae

 
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