Heterobranchia

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Kingdom: Animalia
Subregnum: Eumetazoa
Cladus: ParaHoxozoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis:
Infraclasses (2): Euthyneura - "Lower Heterobranchia"

Superfamiliae Incertae sedis (3†}: †Acteonelloidea – †Nerineoidea – †Streptacidoidea

Familiae Incertae sedis (3†): †Dolomitellidae – †Kuskokwimiidae – †Misurinellidae

Note:: The designation "Lower Heterobranchia" (a temporary WoRMS name pending proper allocation) and the infraclass Euthyneura both now cover all superfamiliae and familiae formerly shown under the now obsolete Opisthobranchia, Pulmonata, Rhodopemorha and Triganglionata.

Heterobranchia Burmeister, 1837

• Burn, R. 2006. A checklist and bibliography of the Opisthobranchia (Mollusca: Gastropoda) of Victoria and the Bass Strait area, south-eastern Australia. Museum Victoria Science Reports, (10) DOI: 10.24199/j.mvsr.2006.10 .Reference page. 
• Caballer Gutiérrez, M., Ortea, J., Rivero, N., Carias Tucker, G., Malaquias, M.A.E. & Narciso, S. 2015. The opisthobranch gastropods (Mollusca: Heterobranchia) from Venezuela: an annotated and illustrated inventory of species. Zootaxa 4034(2): 201–256. DOI: 10.11646/zootaxa.4034.2.1. Preview (PDF) Reference page. 
• Grández, A., Ampuero, A. & Barahona, S.P. 2023. Peruvian nudibranchs (Mollusca, Gastropoda, Heterobranchia): an updated literature review-based list of species. Zookeys 1176ː 117–163. DOI: 10.3897/zookeys.1176.103167 Reference page. 
• Nithyanandan, M., Al-Kandari, M. & Mantha, G. 2021. New records of nudibranchs and a cephalaspid from Kuwait, northwestern Arabian Gulf (Mollusca, Heterobranchia). ZooKeys 1048: 91–107. DOI: 10.3897/zookeys.1048.66250 Reference page. 

• Heterobranchia in the World Register of Marine Species