PaleoDB taxon number: 111264
Alternative spelling: Opisthobranchiata
Parent taxon: Gastropoda according to M. Harzhauser 2007
Sister taxa: Acteonoidea, Admetidae, Alamirifica, Alectrionidae, Amphigastropoda, Archaeobranchia, Auroraella, Beekmanoceras, Bellerophontida, Bicuerda, Brachycerithium, Briardia, Bucardites, Buccinites, Bulimella, Bulimulidae, Bulimus, Bullaea, Capulus sellardsi, Cavolinioidea, Chartrionella, Chippewaella, Chlathrus, Chrysodomidae, Chuchleconus, Cithna, Cocculiniformia, Cyclostoma, Dextrobranchia, Dicathais, Dicosmus, Doliidae, Elmira, Eogastropoda, Euthyneura, Fruiticicoiidae, Gadinidae, Galeodea schencki, Galericulus, Geinitzia, Geinitzia carinata, Globulitopa, Gordenella, Gryphellina, Hecatastoma, Helicarionoidea, Helicites, Helictes, Helminthoglyptidae, Holyneconcha, Hyalaea, Hypsogastropoda, Hyrcania, Isaea, Iteria, Juliidae, Liris, Lovonemetrida, Luoguella, Luoguispira, Lysechinus, Lysechinus incongruens, Mahajangina, Mathildidae, Microcochlis, Mitrularia, Neptuneidae, Neritaemorpha, Neritimorpha, Neritites, Notodelphinula, Opisthonematidae, Orthogastropoda, Oxychilus, Pectinibranchia, Pejona, Peraubium, Phorus, Pitonnellus, Platyostomella, Platystoma, Plectopyloidea, Plicatusidae, Polygyridae, Pragoserpulinidae, Prasinidae, Prosobranchia, Pseudobrochidium, Pseudotylostoma, Ptenoglossa, Pteronotus, Pteropoda, Pulmonata, Pupillacea, Pythia, Rhytidopilidae, Rotellina, Scalariidae, Serpulopsis, Siphonaliidae, Sorbeoconcha, Spiraxidae, Spirgvaleia, Streptoneura, Stuorilda, Suprazonalia, Taeniodomus, Thatcheriidae, Tirolthilda, Tornatella, Tortifusus, Toxonema, Tripartella, Trochifusus, Trochiletes, Trochopsis, Trochotremaria, Trochulus, Urocoptidae, Vespertilio, Zeminolia, Zlichovia
Subtaxa: Acanthotrophia, Acochlidea, Anaspidea, Buscotypus, Canepina, Cephalaspida, Cephalaspidea, Cylindrobullinoidea, Floribella, Gymnosomata, Heteroptygmatis, Heterostrophia, Lutima, Mariottia, Mistostigma, Nicosiaella, Notaspidea, Nudibranchia, Pseudofusia, Reticulacella, Rhodopemorpha, Sacoglossa, Scorbinidola, Tectibranchia, Thecosomata, Umbraculomorpha
Ecology: epifaunal