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Euopisthobranchia is a taxonomic clade of snails and slugs in the clade Heterobranchia within the clade Euthyneura. This clade was established as a new taxon by Jörger et al. in October 2010. Euopisthobranchia is a monophyletic portion of the Opisthobranchia as that taxon was traditionally defined but is not a replacement name for that group as several marine opisthobranch orders including Sacoglossa and Acochlidiacea are not included.

Euopisthobranchia consist of the following taxa:

  • Umbraculoidea
  • Anaspidea
  • Runcinacea
  • Pteropoda
  • Cephalaspidea s.s.