Representative shells of Heterogen japonica (Martens, 1861) from Japan, deposited in the collection of the National Museum of Nature and Science, Tokyo, which were treated as Viviparus sclateri (Frauenfeld, 1865) in Iwakawa (1919). a: 2959J from Lake Kasumigaura, Ibaraki Pref. b-g: specimens from Lake Suwa, Nagano Pref. (b: 2960J, c-e: 2961J, f-g: 2962J). h: 2963J from the western part of Aichi Pref. i: 2964J from Lake Biwa, Shiga Pref. j: 2966J from Hikone City, Shiga Pref. k: 2967J from Maibara City, Shiga Pref. l-m: 2968J from Tsukuma Lagoon, Shiga Pref. (l: adult, m: young).

  
  Part of: Saito T, Kagawa O (2020) New insights from museum specimens: a case of Viviparidae (Caenogastropoda: Mollusca) in Iwakawa’s collection preserved in the National Museum of Nature and Science, Tokyo. Biodiversity Data Journal 8: e52233. https://doi.org/10.3897/BDJ.8.e52233