New Record of Third-Stage Larvae of Hysterothylacium aduncum (Nematoda: Anisakidae) from Neomysis intermedia (Crustacea: Mysidae) in a Freshwater Lake in Hokkaido, Japan

Abstract

Neomysis intermedia (Mysidacea) and Thermocyclops sp. (Copepoda) were examined as possi-ble intermediate hosts for Hysterothylacium aduncum in a freshwater lake, Hokkaido, and only the former was found infected (infection rate 0.49%). The nematode is described and identified as third-stage larva of H. aduncum. The life cycle of H. aduncum in the lake is discussed.