Berthella californica (Dall, 1900) [Pleurobranchus]
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Taxonomy:
Class: Gastropoda  Cuvier, 1797
Subclass: Heterobranchia  J.E. Gray, 1840
Clade: Euthyneura  Spengel, 1881
Clade: Nudipleura  Wägele & Willan, 2000
Subclade: Pleurobranchomorpha  Schmekel, 1985   (formerly NOTASPIDEA)
Superfamily:  Pleurobranchoidea  J.E. Gray, 1827
Family:  Pleurobranchidae  J.E. Gray, 1827
Genus:  Berthella  de Blainville, 1824
Species: Berthella californica (Dall, 1900) [Pleurobranchus]

formerly:
Class: GASTROPODA   Cuvier, 1797 
Subclass: OPISTHOBRANCHIA Milne-Edwards, 1848 
Order: NOTASPIDEA  Fischer, P., 1883 

However, in the new taxonomy of Bouchet & Rocroi (2005), the family Pleurobranchidae has been placed in the superfamily Pleurobranchoidea, the only family belonging to the subclade Pleurobranchomorpha (sister to the subclade Nudibranchia), part of the clade Nudipleura.
Have a look at:
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). 
"Classification and nomenclator of gastropod families". 
Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1–397. 
ISBN 3925919724. ISSN 0076-2997. 
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Berthella californica

Northeastern
Pacific Ocean

Eastern Pacific Ocean
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