spongomonad spongomonad the spongomonads are a group of flagellated protists in the phylum cercozoa. taxonomically, they compose the family sarcomonadidae and order sarcomonadida. they were originally placed among the reticulofilosa, but were later transferred to monadofilosa. it includes only two genera: spongomonas stein 1878 rhipidodendron stein 1878 spongomonad rhipidodendron splendidum scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: cercozoa class: imbricatea order: spongomonadidahibberd 1983 family: spongomonadidaekarpov 1990 genera rhipidodendron spongomonas