Kalmar "Genus Anguilla" tana nufin rarrabuwa taxonomic da ake amfani da ita a ilmin halitta don haɗa wani nau'in nau'in nau'in nau'in nau'in nau'in nau'in nau'in nau'in nau'in nau'i. A wannan yanayin, yana nufin nau'in ciyawar ruwa da ruwan gishiri, wanda ya haɗa da kusan nau'in ƙwai 19 da ake samu a duk faɗin duniya. Sunan "Anguilla" ya samo asali ne daga kalmar Latin don eel.
