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the former Order NOTASPIDEA  P. Fischer, 1883 was 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:  Umbraculidae  Dall, 1889

Class:  Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Clade:  Euthyneura  Spengel, 1881
Clade:  Nudipleura  Wägele & Willan, 2000
Subclade:  Pleurobranchomorpha  Schmekel, 1985
Superfamily:  Pleurobranchoidea   J.E. Gray, 1827
Family:  Pleurobranchidae  J.E. Gray, 1827
Subfamily:  Pleurobranchinae  J.E. Gray, 1827


Berthellina citrina

Pleurobranchus forskalii
     

 
 
 
 
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