former taxonomy:
Class: GASTROPODA Cuvier, 1797
Subclass: OPISTHOBRANCHIA Milne-Edwards, 1848
Order: NUDIBRANCHIA Cuvier, 1817
on the recent taxonomy see WoRMS:
MolluscaBase eds. (2020). Facelina Alder & Hancock, 1855. Accessed through:
World Register of Marine Species
at:
http://www.marinespecies.org/aphia.php?p=taxdetails&id=1379978 on 2020-10-17
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