former taxonomy:
Class: GASTROPODA Cuvier, 1797
Subclass: OPISTHOBRANCHIA Milne-Edwards, 1848
Order: NUDIBRANCHIA Cuvier, 1817
on the recent taxonomy see WoRMS:
MolluscaBase (2019). Thecacera J. Fleming, 1828. Accessed through: World Register of Marine Species
at:
http://www.marinespecies.org/aphia.php?p=taxdetails&id=138371 on 2019-02-25
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