Order Centrohelida Kuhn 1926

Family Acanthocystidae Claus 1874

Genus Acanthocystis Carter 1863

• Acanthocystis pectinata Penard 1889 – freshwater - Mikrjukov, 1994.
• Acanthocystis penardi Wailes 1925 – freshwater - Mikrjukov, 1994.
• Acanthocystis saphonovi Mikrjukov 1994 – type locality, marine, on sponges, on dead clamshells - Mikrjukov, 2001.
• Acanthocystis turfacea Carter 1863 – freshwater - Mikrjukov, 1994. Acanthocystis aff. turfacea Carter 1863 - freshwater, marine; in chemocline of coastal meromictic lake Trekhtzvetnoe (Mindolina, 2025).

Genus Cernunnos Gerasimova 2023 Cernunnos arctica Mindolina, Plotnikov et Gerasimova 2023 (Modern taxonomy: Centroplasthelida Febvre-Chevalier et Febvre 1984; Order Pterocystida Cavalier-Smith et Heyden 2007; Clada Pterista Shɨshkin et Zlatogursky, 2018) - marine, in semoislolated marine в lagoon on the Cape Zeleny (Gerasimova et al., 2023; DOI: 10.1111/jeu.12992).

Genus Choanocystis Penard 1904

• Choanocystis aculeata (Hertwig et Lesser 1874) – freshwater - Mikrjukov, 1994. Choanocystis aculeata (Hertwig & Lesser 1874) Siemensma & Roijackers 1998 - freshwater, brackish, marine; in meromictic lake Trekhtzvetnoe (Mindolina, 2025).
• Choanocystis kareliensis Mikrjukov 1994 - type locality, marine, sublittoral, often in diluted waters - Mikrjukov, 2001.
• Choanocystis pantopoda (Penard 1904) Siemensma 1991 – freshwater- Mikrjukov, 1994.
• Choanocystis pelagica (Ostenfeld 1904) Mikrjukov 1994 – marine, often on dead clamshells - Mikrjukov, 2001.
• Choanocystis rotundata (Nicholls 1983) – freshwater - Mikrjukov, 1994.

Family Heterophryidae Poche 1913

Genus Heterophrys Archer 1869

• Heterophrys marina Hertwig et Lesser 1874 – marine, brackish-water, Chernaya River – Mikrjukov, 1994.
• Heterophrys minutus (Walton1905) Mikrjukov 2002 (= Microsol borealis Dons 1918, *Cienkowskya mereschkowskyi sensu Mikrjukov, 1994 and Heterophrys febvrechevalierae Mikrjukov 1996) – marine, sublittoral, on brown and red algae - Mikrjukov, 2001.

Genus Chlamydaster Rainer 1968

• Chlamydaster sterni Rainer 1968 – freshwater, brackish-water, Chernaya River - Mikrjukov, 2001.

Family Pterocystidae Cavalier-Smith & von der Heyden, 2007

Genus Pterocystis Siemensma & Roijackers, 1988

• Pterocystis striata (Nicholls 1983) Siemensma and Roijackers 1988 - freshwater; in plankton of meromictic lake Trekhtzvetnoe (Mindolina, 2025).

Family Raphidiophryidae Mikrjukov 1996

Genus Polyplacocystis Mikrjukov 1996

• Polyplacocystis arborescens (Jones 1974) Mikrjukov 2001- marine, sublittoral, single and colonial, sedentary and floating.- Mikrjukov, 2001.

Genus Parasphaerastrum Mikrjukov 1996

• Parasphaerastrum marina (Ostenfeld 1904) Mikrjukov 1996 – type locality, and diluted waters - Mikrjukov, 2001.

Genus Raphidiophrys Archer 1867

• Raphidiophrys elegans Hertwig et Lesser 1874 emend. Penard 1904. – freshwater- Микрюков 1994.
• Raphidiophrys intermedia Penard 1904 – freshwater- Микрюков, 1994.

Genus Raphidocystis Penard 1904

• Raphidocystis tubifera Penard 1904– freshwater- Mikrjukov, 2001.

rus: Отряд Centrohelida Kuhn 1926