:Metopus filum

{{Short description|Species of single-celled organism}}

{{Taxobox

| domain = Eukaryota

| unranked_regnum = SAR

| unranked_superphylum = Alveolata

| phylum = Ciliophora

| subphylum = Intramacronucleata

| classis =

| ordo = Armophorida

| familia = Metopidae

| genus = Metopus

| species = M. filum

| binomial = Metopus filum

| binomial_authority = Vďačný & Foissner, 2016

}}

Metopus filum is a species of metopid first found in soil from the Murray River floodplain, Australia. It can be distinguished from its congeners by its thin body, an absence of cortical granules, and a low number of ciliary rows and adoral polykinetids.{{cite journal|last1=Vďačný|first1=Peter|last2=Foissner|first2=Wilhelm|title=A huge diversity of metopids (Ciliophora, Armophorea) in soil from the Murray River floodplain, Australia. I. Description of five new species and redescription of Metopus setosus Kahl, 1927|journal=European Journal of Protistology|year=2016|issn=0932-4739|doi=10.1016/j.ejop.2016.12.001|pmid=28131035|volume=58|pages=35–76}}