蚌壳虫(Clam Shrimp)是淡水水域中底栖游动动物,通称介甲动物。在动物界,它们隶属于二节肢动物门、有鳃亚门、甲壳纲、鳃足亚纲、介甲目。下分2亚目5科21属。迄今,全世界共报导了278种18亚种。我国有27种,分布在13个省、自治区。蚌壳虫体外具有左右对称的两片蚌形的几丁质外壳,壳长5.5—14毫米,呈黄褐色或深褐色,略透明。壳面生有数目不等的同心环形生长线。两壳在背面相连接,背面的突出部分称壳顶。壳腹缘:光滑或生短毛。前、后背缘圆滑或形成前、后背角。两壳之内是 Clam Shrimp (Clam Shrimp) is a benthic fauna in freshwater waters, commonly known as canker. In the animal kingdom, they belong to the two arthropods, with the subgranules, crustaceans, gill foot subfamily, armor head. Sub-2 sub-5 families and 21 genera. To date, 278 species of 18 subspecies have been reported worldwide. There are 27 species in our country, distributed in 13 provinces and autonomous regions. Clam shellfish body with two symmetrical symmetrical two clam-shaped chitin shell, shell length 5.5-14 mm, was brown or dark brown, slightly transparent. There are a number of concentric rings that grow on the shell surface. Two shells are connected on the back, the back of the prominent part of the shell top. Abdomen of the shell: smooth or short hairs. Before and after the back edge of the smooth or formed before and after the back corner. Within two shells is