The First Record of Bodotria parva Calman, 1907 (Cumacea: Bodotriidae) in the Estuarine Waters of Sakhalin Island (Aniva Bay, Sea of Okhotsk)

Cumacea of the genus Bodotria (Bodotriidae, Cumacea) were found in the estuary of Susuya River (southern Sakhalin Island) in September 2022. The material was collected in the river mouth and 400 m upstream in the zone of influence of tidal sea waters of Aniva Bay (Sea of Okhotsk) at a depth from 0.25 to 1.35 m on fine sand with pebbles, less often on fine sand with silt and detritus. The individuals found in this estuary do not belong to Bodotria furugelmiensis Tzareva & Vassilenko, 2006 and Bodotria ozolinshi Tsareva & Vassilenko, 1993 known from the Far Eastern seas of Russia, but they correspond to the morphological features of Bodotria parva Calman, 1907. The natural range of Bodotria parva is located in the shallow coastal waters of the Pacific Coast of East Asia: Thailand, China, Korea, and Japan. The invasive range is unknown. Presumably, this invader was accidentally introduced into the Sea of Okhotsk with ballast waters. It is important to monitor the distribution of this cumacea in order to predict the consequences for endemic species and local ecosystems.