Order Eunothiales

Family Eunotiaceae Kützing

Genus Actinella F.W. Lewis

• Actinella punctata F.W. Lewis – freshwater; periphyton (Dressler, 2003).

Genus Eunotia Ehrenberg

• Eunotia ambivalens Lange-Bertalot & Tagliaventi – freshwater, plankt., in the plankton of meromictic lake Trekhtzvetnoe (Mindolina, 2025; Ivanova, 2025, personal communication).
• Eunotia arcus Ehrenberg – marine, littoral; sporadic (Бондарчук, 1970). Freshwater; periphyton (Dressler, 2003).
• Eunotia bilunaris (Ehrenberg) Mills – marine, littoral; benthic, periphyton sporadic (Бондарчук, 1970: E. lunaris (Ehrenberg) Grunow; E. lunaris var. subarticulata – single finding in diluted area of the Rugozerskaya Bay). Marine, mouth area of the Nilma River; planktonic; dominant (Лихачёва, 2003: E. lunaris). Freshwater; periphyton (Dressler, 2003).
• Eunotia diodon Ehrenberg – freshwater; periphyton (Dressler, 2003).
• Eunotia faba (Ehrenberg) Grunow – marine, littoral; benthic, periphyton; sporadic (Бондарчук, 1970). Freshwater; periphyton (Dressler, 2003).
• Eunotia flexuosa (Brébisson) Kützing – freshwater; periphyton (Dressler, 2003).
• Eunotia hemicyclus (Ehrenberg) Ralfs – freshwater; periphyton (Dressler, 2003).
• Eunotia hexaglyphis Ehrenberg – freshwater; periphyton (Dressler, 2003).
• Eunotia incisa W.Smith ex W. Gregory – freshwater; periphyton (Dressler, 2003).
• Eunotia intermedia (Krasske) Nörpel & Lange-Bertalot – freshwater; periphyton (Dressler, 2003).
• Eunotia minor (Kützing) Grunow – freshwater; periphyton (Dressler, 2003).
• Eunotia paralella Ehrenberg – marine, littoral; single finding (Бондарчук, 1970).
  • E. paralella var. angusta Grunow – freshwater; periphyton (Dressler, 2003).
• Eunotia pectinalis (Kützing) Rabenhorst – marine, littoral; single finding (Бондарчук, 1970).
• Eunotia praerupta Ehrenberg var. praerupta – marine, littoral, diluted areas; rare (Бондарчук, 1970).
  • E. praerupta var. inflata Grunow – single finding in the Rugozerskaya Bay (Бондарчук, 1970).
  • E. praerupta var. praerupta s.str. – freshwater; periphyton (Dressler, 2003).
• Eunotia robusta Ralfs – freshwater, Verkhneye (Upper) Lake, Verkhneye (Upper) Lake; planktonic (Бизина, 1998).
• Eunotia serra Ehrenberg – freshwater; periphyton (Dressler, 2003: E. serra var. serra and E. serra var. tetraodon (Ehrenberg) Nörpel).
• Eunotia sudetica O. F. Müller – marine, littoral; single finding on a significantly diluted area (Бондарчук, 1970).
• Eunotia triodon Ehrenberg – marine, littoral, Rugozerskaya Bay; single finding (Бондарчук, 1970). Freshwater; periphyton (Dressler, 2003).
• Eunotia veneris (Kützing) De Toni – marine, littoral, Rugozerskaya Bay; sporadic (Бондарчук, 1970).

Family Peroniaceae (Karsten) Topachevs'kyi & Oksiyuk

Genus Peronia Brébisson & Arnott ex Kitton

• Peronia fibula (Brébisson ex Kützing) R. Ross – freshwater; periphyton (Dressler, 2003).

rus: Порядок Eunothiales