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

Superfamily: Umbraculoidea  Dall, 1889 (1827)
Family: Tylodinidae  J.E. Gray, 1847


Tylodina fungina
       

Family: Umbraculidae  Dall, 1889


Umbraculum umbraculum
       

Class: Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Clade: Euthyneura  Spengel, 1881
Clade: Nudipleura Waegele & Willan, 2000

Clade: Pleurobranchomorpha  Schmekel, 1985
Superfamily: Pleurobranchoidea  J.E. Gray, 1827
Family: Pleurobranchidae  J.E. Gray, 1827
Subfamily: Pleurobranchinae  J.E. Gray, 1827


Berthella agassizii

Berthella californica 

Berthella grovesi 

Berthella strongi

Berthellina ilisima

Pleurobranchus areolatus
       

 
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