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Pleurobranchomorpha
The order Pleurobranchomorpha includes flattened species with rolled rhinophores, a plume-like gill concealed between the mantel and foot on the left side of the body and, usually, a small internal shell. Most feed on a variety of sessile taxa including sponges, tunicates and scleractinian corals although some may scavenge or prey on larger animals. The skin produces an acid secretion when the animal is disturbed, presumably for defense. The Pleurobranchomorpha were formerly included with the Tylodinoidea in the order Notaspidea. One family is known from Hawaii.

Pleurobranchidae
 
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