Habitat and live specimens of Jesogammarus (Jesogammarus) acalceolus sp. nov. A the type locality, Haguro Shrine Spring, Hirosaki, Aomori Prefecture, Japan B mate guarding pair, male is upper and female is lower, photographed by Ryu Uchiyama.

 
 
  Part of: Tomikawa K, Kimura N (2021) On the brink of extinction: a new freshwater amphipod Jesogammarus acalceolus (Anisogammaridae) from Japan. ZooKeys 1065: 81-100. https://doi.org/10.3897/zookeys.1065.71687