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the former Order NOTASPIDEA  P. Fischer, 1883 was splitted:
Class:  Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Infraclass:  Euthyneura  Spengel, 1881
Subterclass:  Tectipleura  Schrödl, Jörger, Klussmann-Kolb & Wilson, 2011
Order:  Umbraculida  Odhner, 1939
Superfamily:  Umbraculoidea  Dall, 1889 (1827)
Familie: Tylodinidae  J.E. Gray, 1847


Tylodina fungina
       

Family: Umbraculidae  Dall, 1889


Umbraculum umbraculum
       

Class:  Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Infraclass:  Euthyneura  Spengel, 1881
Superorder:  Nudipleura  Wägele & Willan, 2000
Order:  Pleurobranchida  J.E. Gray, 1827

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 digueti
       

 
 
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