leucodictyida leucodictyida leucodictyids are heterotrophic amoeboid protists that comprise the order leucodictyida in the phylum cercozoa. leucodictyida scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: cercozoa class: granofilosea order: leucodictyidacavalier-smith, 1993 emend. 2003 type genus leucodictyongrell, 1991 families leucodictyidae massisteriidae morphology leucodictyids are biciliate amoebae with branching filopodia that are capable of fusing temporarily with each other to form structures known as meroplasmodia. these filopodia can bear extrusomes, and are appressed to the substrate while supported in part by irregularly arranged microtubules. inside the cell itself, an important characteristic is the presence of tubular mitochondrial cristae. taxonomy leucodictyida was described in 1993 as a monotypic order containing only the family leucodictyidae. later, in 2003, it was emended to also contain the family massisteriidae. it currently contains a total of 4 genera. family leucodictyidae cavalier-smith, 1993 leucodictyon grell, 1991 reticulamoeba grell, 1994 family massisteriidae cavalier-smith, 1993 massisteria larsen & patterson, 1990 minimassisteria arndt & cavalier-smith, 2011