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Pleurobranchomorpha
The order
Pleurobranchomorpha includes flattened species with rolled rhinophores,
a plume-like gill concealed between the mantle and foot on the right
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.
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