This dataset contains the digitized treatments in Plazi based on the original journal article Hayashi, Masakazu, Kamite, Yuuki (2020): Description of larvae of Japanese Macronychini (Coleoptera: Elmidae: Elminae). Zootaxa 4859 (2): 195-227, DOI: https://doi.org/10.11646/zootaxa.4859.2.2