↑Leander BS, Ramey PA (2006). “Cellular identity of a novel small subunit rDNA sequence clade of apicomplexans: description of the marine parasite Rhytidocystis polygordiae n. sp. (host: Polygordius sp., Polychaeta)”. 《Journal of Eukaryotic Microbiology》 53 (4): 280–291. doi:10.1111/j.1550-7408.2006.00109.x. PMID16872296.