former taxonomy:
Class: GASTROPODA Cuvier, 1797
Subclass: OPISTHOBRANCHIA Milne-Edwards, 1848
Order: NOTASPIDEA P. Fischer, 1883
on the recent taxonomy see WoRMS:
MolluscaBase eds. (2021). Berthellina Gardiner, 1936. Accessed through:
World Register of Marine Species
at:
http://www.marinespecies.org/aphia.php?p=taxdetails&id=138362 on 2021-02-09
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