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) (formerly NOTASPIDEA)

Sorry, I have no Umbraculoidea photos yet.

Class: Gastropoda   Cuvier, 1797 
Subclass:  Heterobranchia Gray J.E., 1840
Clade: Nudipleura Waegele & Willan, 2000 
Clade: Euthyneura Spengel, 1881
Clade: Pleurobranchomorpha Schmekel, 1985 (formerly NOTASPIDEA)

Sorry, I have no Pleurobranchomorpha photos yet.