cavosteliid noun1 •Any slime mold of the family Cavosteliidae.Only five of these eight lineages belong to the Eumycetozoa. These are the protosporangiids, protosteliids, soliformoviids, cavosteliids, and schizoplasmodiids (Shadwick et al., 2009). — 2017 formscavosteliids