Notaspidea

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Notaspidea (Pleurobranchomorpha; class Gastropoda, subclass Opisthobranchia) An order of opisthobranch gastropods most of which have flat bodies and most of which are similar to slugs. There is no mantle cavity, and the shell is external or, if internal, reduced. One true gill is present. Most Notaspidea are grazing carnivores.