大型鰓脚類の分布状況を把握するため,佐渡を除く新潟県の水田において調査を行った.累計で8000筆を超える水田を調査した結果,5種の大型鰓脚類が見つかった:カイエビ,トゲカイエビ,ムスジヒメカイエビ,タマカイエビ,ホウネンエビ.このうち,カイエビは越後平野北部で連続性のいい分布を持ち,その南限は歴史的な景観の境界と一致する.
Surveys of large branchiopods of the rice paddies in Niigata Prefecture excluding Sado Island, Japan, were performed to identify the distribution. Five species were found as a result of the surveys conducted in more than 8,000 paddies (cumulative): Caenestheriella gifuensis (Ishikawa), Lepthersteria kawachiensis Ueno, Eulimnadia packardiana Ishikawa, Lynceus biformis (Ishikawa) and Branchinella kugenumaensis (Ishikawa). Of these, C. gifuensis has a continuous wide distribution in the north part of the Echigo Plain with a sharp border in the south, which is corresponding to the historical landscape border.