Volume LII (I)
| Oláh, J., Vinçon, G. & Coppa, G.: On the Trichoptera of Italy with delineation of incipient sibling species. PDF/A published: 24.02.2021 | 03–67 |
| Sharma, B.K. & Sharma, S.: Biodiversity of Indian Rotifers (Rotifera) with remarks on biogeography and richness in diverse ecosystems. PD/A published: 11.05.2021 | 69–97 |
| Shumka, S.: Checklist of rotifer species from Albania (phylum Rotifera). PDF/A published: 28.06.2021 | 99–109 |
| Tavuç, İ.: In Memoriam Prof. Dr. İbrahim Mete Mısırlıoğlu. PDF/A published: 28.06.2021 | 111–117 |