Order Myzocytiopsidales

Family Ectrogellacea Cejp.

Genus Ectrogella Zopf

• Ectrogella bacillariacearum Zopf – freshwater; parasite on diatoms; everywhere, common, sometimes dominant (Кузнецов, 2003).
• Ectrogella eunotiae Friedmann – freshwater, Verkhneye (Upper) Lake; parasite on Eunotia; rare (Кузнецов, 2003).
• Ectrogella eurychasmoides Feldmann & Feldm.-Maz. – marine, littoral, sublittoral; parasite on Licmophora, rare; Pylaiella, common (Кузнецов, 2003). Parasite on Zostera, sporadic (Kuznetsov, Vekhov, 2001).
• Ectrogella monostoma Scherff. – freshwater; parasite on Synedra, Pinnularia; rare (Кузнецов, 2003).
• Ectrogella perforans H. E. Petersen – marine, littoral, sublittoral; parasite on Licmophora, Rhabdonema; sporadic (Алим, 1962). Parasite on Licmophora, Synedra; very often (Кузнецов, 1979).

Family Eurychasmataceae H.E. Petersen

Genus Eurychasma Magnus

• Eurychasma dicksonii (E. P. Wright) Magnus – marine, sublittoral; parasite on Ectocarpus, Stictyosiphon; sporadic (Алим, 1962). Parasite on Pylaiella; common, sometimes dominant (Кузнецов, 2003).

Genus Eurychasmidium Sparrow

• Eurychasmidium sacculum (H. E. Petersen) M. W. Dick – marine; parasite on Devalerae ramentacea, Palmaria palmatа, Zostera; rare (Kuznetsov, Vekhov, 2001: Eurychasma sacculus H. E. Petersen).
• Eurychasmidium tumefaciens (Magnus) Sparrow – marine; parasite on red algae; common (Кузнецов, 2003).

Family Myzocytiopsidaceae M. W. Dick

Genus Gonimochaete Drechsler

• Gonimochaete cf. latitubus S. Y. Newell et al. – marine, littoral; parasite on nematodes; sporadic (Кузнецов, 2003).

Genus Syzygangia M. W. Dick

• Syzygangia elliptica (De Wild.) M. W. Dick – freshwater, Ershovskie lakes; on mosses; sporadic (Кузнецов, 2003: Lagenidium ellipticum De Wild.).
• Syzygangia nodosa (P. A. Dang.) M. W. Dick – brackish-water; parasite on Lyngbia (Кузнецов, 2003: Lagenidium nodosum (P. A. Dang.) Ingold).
• Syzygangia papillosa (Cocc.) M. W. Dick – freshwater; parasite on Spirogyra; common (Кузнецов, 2003: Lagenidium papillosum Cocc.).

Family Pontismataceae H.E. Petersen

Genus Petersenia Sparrow

• Petersenia irregulare (Lagerh.) Sparrow – freshwater; parasite on Achlya, Saprolegnia; common (Кузнецов, 2003: P. irregulare (Const.) Sparrow).
• Petersenia lobata (H. E. Petersen) Sparrow – marine, sublittoral; parasite on Callithamnion; sporadic (Алим, 1962). Parasite on Zostera; sporadic (Kuznetsov, Vekhov, 2001). Freshwater; parasite on Pythium; rare; Saprolegnia; common; Allomyces; rare (Кузнецов, 2003).
• Petersenia palmariae Van der Meer & Pueschel – marine, littoral; parasite on Palmaria palmatа; rare (Кузнецов, 2003).
• Petersenia pollagaster (H. E. Petersen) Sparrow – marine; parasite on Ceramium, Polysiphonia; rare (Кузнецов, 2003).

Genus Pontisma H. E. Petersen

• Pontisma lagenidioides H. E. Petersen – marine, littoral; parasite on Ceramium virgatum; sporadic (Алим, 1962). Parasite on Ceramium spp.; rare (Кузнецов, 2003).
• Pontisma magnusii (Feldmann & Feldm.-Maz.) M. W. Dick – marine, littoral, sublittoral; parasite on Ceramium; rare (Кузнецов, 2003: Olpidiopsis magnusii Feldmann & Feldm.-Maz.).

Family Sirolpidiaceae Sparrow ex Cejp.

Genus Pseudolpidiella Cejp

• Pseudolpidiella sphaeritae (P. A. Dang.) Cejp – freshwater; parasite on Sphaerita endogena; sporadic (Кузнецов, 2003).

Genus Sirolpidium H. E. Petersen

• Sirolpidium bryopsidis (de Bruyne) H. E. Petersen – marine, littoral; parasite on Cladophora (Spongomorpha); sporadic (Алим, 1962). Parasite on green algae (Кузнецов, 2003).

rus:Порядок Myzocytiopsidales