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the formerly Order NOTASPIDEA  Fischer, P., 1883 is splitted:
Class: Gastropoda   Cuvier, 1797 
Subclass:  Heterobranchia Gray J.E., 1840
Clade: Euthyneura Spengel, 1881
Clade: Euopisthobranchia Jörger et al., 2010

Superfamily:  Umbraculoidea  Dall, 1889 (1827) (Ex-NOTASPIDEA) 
Family: Umbraculidae  de Férussac, 1822


Umbraculum umbraculum
       

Clade: Pleurobranchomorpha Schmekel, 1985 
Superfamily: Pleurobranchoidea   Gray, 1827  (Ex-NOTASPIDEA) 
Family: Pleurobranchidae  Gray, 1827
Subfamily: Pleurobranchinae  Gray, 1827


Pleurobranchus areolatus
       

Subfamily: Pleurobranchaeinae Pilsbry, 1896


Pleurobranchaea inconspicua
       

 
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