Abstract—In July 2018, in the estuary of the Sura River (a tributary of the first order of the Cheboksary reservoir, Nizhny Novgorod oblast, Russia), a tropical exogenous copepod Thermocyclops taihokuensis Harada, 1931 (Copepoda: Cyclopoida) was found. Information on the finding of this species in the European part of Russia is extremely scarce. There is only one report of a finding of this species in the lower reaches of the Volga River. The main habitat of T. taihokuensis is in East and Central Asia, as well as tropical regions. This paper presents a brief description of T. taihokuensis with updated drawings. The T. taihokuensis females registered in the estuarine area of the Sura River had an average size of 1060 ± 20 μm. The spread of tropical crustaceans beyond their natural habitat appears to be linked to human activities and the transport of ballast water by ships. In addition, the concept of zoochoria suggests that the settlement of this species may be associated with the transfer of T. taihokuensis at the resting stages by migratory species of waterfowl. Thus, migration routes of various bird species from the Arctic and temperate climatic zones to subtropical and tropical regions cross the European part of Russia. Alien species have high phenotypic and ecological plasticity and are able to cause imbalances in ecosystems. Therefore, new studies of the Sura River and the Cheboksary reservoir will help not only to assess the success of the naturalization of T. taihokuensis, but also to estimate the environmental consequences of the penetration of this species into the territory of the European part of Russia.

摘要— 2018年7月，在苏拉河河口（俄罗斯下诺夫哥罗德州切博克萨雷河水库的一级支流）发现了热带外来co足类热循环体taihokuensis原田，1931年（Co足类：Cyclopoida）。在俄罗斯欧洲部分发现该物种的信息极为匮乏。在伏尔加河下游，只有一种报道发现了这种物种。台北山竹的主要栖息地在东亚和中亚以及热带地区。本文用更新的图纸简要介绍了泰北山毛榉。该T. taihokuensis在苏拉河河口地区注册的雌性动物的平均大小为1060±20μm。热带甲壳类动物超出其自然栖息地的扩散似乎与人类活动和船舶压载水的运输有关。此外，兽疫的概念表明，该物种的定居可能与太白丁香的转移有关。在休息阶段由水禽迁徙。因此，从北极和温带气候区到亚热带和热带地区的各种鸟类的迁徙路线穿越了俄罗斯的欧洲部分。外来物种具有很高的表型和生态可塑性，能够引起生态系统的失衡。因此，对苏拉河和切博克萨雷水库进行的新研究不仅将有助于评估taihokuensis驯化的成功，而且还将有助于估计该物种渗透到俄罗斯欧洲部分的环境后果。 。