Bivalvia - Protobranchia

Synonyms: Huxleyidae Scarlato and Starobogatov 1971, Nucinellidae Vokes 1956

Parent taxon: Manzanelloidea according to E. V. Coan and P. Valentich-Scott 2012

Sister taxa: none

Subtaxa: Cyrillista, Diabolica, Huxleyia, Manzanella, Nucinella, Posterodonta

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Ecology: facultatively mobile infaunal chemosymbiotic