Slopalinida

{{Short description|Order of single-celled organisms}}

{{taxobox

| domain = Eukaryota

| unranked_regnum = SAR

| superphylum = Heterokonta

| phylum = Placidozoa

| classis = Opalinea

| ordo = Slopalinida

| ordo_authority =

| subdivision_ranks = Families

| subdivision =

}}

Slopalinida is a heterokont order.{{cite journal |vauthors=Kostka M, Hampl V, Cepicka I, Flegr J |title=Phylogenetic position of Protoopalina intestinalis based on SSU rRNA gene sequence |journal=Mol. Phylogenet. Evol. |volume=33 |issue=1 |pages=220–4 |date=October 2004 |pmid=15324850 |doi=10.1016/j.ympev.2004.05.009 }}{{cite journal | last1 = Patterson | first1 = D.J. | year = 1985 | title = The fine structure of Opalina ranarum (Family Opalinidae): Opalinid phylogeny and classification | journal = Protistologica | volume = 21 | pages = 413–428 }}{{cite web |url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=42740&lvl=2 |title=www.ncbi.nlm.nih.gov |access-date=2009-06-17}}