Recently, based on a limited morphological characterisation and partial 18S rRNA gene sequence, Jiang et al. (2019) described Trypanosoma micropteri Jiang, Lu, Du, Wang, Hu, Su et Li, 2019 as a new pathogen of farmed fish. Here we provide evidence based on the expanded sequence dataset, morphology and experimental infections that this trypanosome does not warrant the establishment as a new species, because it is conspecific with the long-term known Trypanosoma carassii Mitrophanow, 1883, a common haemoflagellate parasite of freshwater fish. The former taxon thus becomes a new junior synonym of T. carassii.

Faculty of Science University of South Bohemia Ceske Budejovice Czech Republic

Guangdong Provincial Key Laboratory of Aquatic Economic Animals State Key Laboratory of Biocontrol School of Life Sciences Sun Yat Sen University Guangzhou PR China

Institute of Parasitology Biology Centre Czech Academy of Sciences Ceske Budejovice Czech Republic

School of Marine Science and Engineering Qingdao Agricultural University Qingdao PR China

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Towards disentangling the classification of freshwater fish trypanosomes