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the 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:  Tylodinidae  J.E. Gray, 1847


Tylodina fungina
       

Class:  Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Clade:  Euthyneura  Spengel, 1881
Clade:  Nudipleura  Wägele & 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 californica

Berthella strongi

Berthellina ilisima
   

Subfamily:  Pleurobranchaeinae  Pilsbry, 1896


Pleurobranchaea californica
       

 
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