ORIGINAL  ARTICLES

Igor V. Senderskiy, Anastasiya N. Ignatieva, Darya S. Kireeva and Viacheslav V. Dolgikh.
Production of polyclonal anti-β-tubulin antibodies and immunodetection of Vairimorpha (Nosema) ceranae (Opisthosporidia: Microsporidia) proliferative stages in the midguts of Apis mellifera and in the Sf9 cell culture.
Protistology 15 (1) 3–9 (2021) | Summary | PDF |
| Published online: March 6, 2021 |

Igor R. Pozdnyakov, Andrey V. Zolotarev and Sergey A. Karpov.
Comparative analysis of zoosporogenesis’ genes of the bastoclad Blastocladiella emersonii and the aphelid Paraphelidium tribonematis reveals the new directions of evolutionary research.
Protistology 15 (1) 10–23 (2021) | Summary | PDF | Supplementary materials |
| Published online: March 29, 2021 |

REVIEWS

Innokentii E. Vishnyakov.
Symphony of minimalism: peculiar endosymbiosis of mycoplasmas and protists.
Protistology 15 (1) 24–33 (2021) | Summary | PDF |
| Published online: March 31, 2021 |

LETTERS  TO  THE  EDITOR

Valeriia Khabibulina, Maksim Melekhin, Mariia Belokon and Nikita Borodin.
First record of the suctorian ciliate Ophryodendron abietinum (Ciliophora, Phyllopharyngea), the epibiont of Hydrozoa in the White Sea.
Protistology 15 (1) 34–40 (2021) | Summary | PDF |
| Published online: April 5, 2021 |

HISTORICAL  MATERIALS

Sergei I. Fokin.
Konstantin Sergeyevitch Merezhkovsky (1855–1921) – the protistologist who discovered the origin of eukaryotic cells.
Protistology 15 (1) 41–45 (2021) | Summary | PDF |
| Published online: April 5, 2021 |

IN  MEMORIAM

Professor Thomas Cavalier-Smith FRS, FRSC (1942–2021).
Protistology 15 (1) 46–48 (2021) | PDF |
| Published online: April 5, 2021 |

INSTRUCTIONS  FOR  AUTHORS
Protistology 15 (1) 49–50 (2020) | PDF |