cristidiscoidea cristidiscoidea cristidiscoidea or nucleariae is a proposed basal holomycota clade in which fonticula and nucleariida emerged, as sister of the fungi. since it is close to the divergence between the main lineages of fungi and animals, the study of cristidiscoidea can provide crucial information on the divergent lifestyles of these groups and the evolution of opisthokonts and slime mold multicellularity. the holomycota tree is following tedersoo et al. opisthokonts holomycota cristidiscoidea fonticulida parvularia nucleariida fungi sensu lato bcg2 freshol1 true fungi aphelida bcg1 rozellomyceta/ rozella namako-37 microsporidia metchnikovellea microsporea cryptomycota holozoa ichthyosporea pluriformea corallochytrium syssomonas filozoa filasterea choanozoa choanoflagellata animalia cristidiscoidea nuclearia thermophila scientific classification domain: eukaryota (unranked): opisthokonta (unranked): holomycota class: cristidiscoidea orders fonticulida nucleariida classification class cristidiscoidea cavalier-smith 1998 order fonticulida cavalier-smith 1993 family fonticulidae worley, raper & hohl 1979 genus fonticula worley, raper & hohl 1979 genus parvularia lópez-escardó 2017 species p. atlantis lópez-escardó 2017 order nucleariida cavalier-smith 1993 family nucleariidae cann & page 1979 genus nuclearia cienkowski 1865