LyonsiellidaeLyonsiellidae is a taxonomic family of marine bivalve molluscs in the superfamily Verticordioidea.GeneraGenera within the family Lyonsiellidae include:Allogramma Dall, 1903Dallicordia Scarlato & Starobogatov, 1983Lyonsiella G.O. Sars, 1872Policordia Dall, Bartsch & Rehder, 1938