Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Next order	Umbraculoidea The order Umbraculoidea (= Tylodinoidea), the umbrella shells, includes species with large, external cap-shaped shells and plume-like gills located between the mantle 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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