Kalmar "Amphiumidae" tana nufin dangin elongated, salamanders na ruwa wanda ke cikin tsari Caudata, wanda aka fi sani da "amphiumas" ko "congo eels." Amphiumas manya ne, masu kama da maciji masu qananan ƙafafu guda huɗu, ƙananan idanuwa, da tsage-tsage waɗanda yawanci sukan ragu ko babu a cikin manya. Suna da santsi, kamar gaɓoɓi waɗanda ba su da huhu da huhu, kuma galibi suna shaka ta cikin fatar jikinsu. Mississippi, Louisiana, da kuma South Carolina. Yawanci ana samun su a cikin jikunan ruwa masu tafiyar hawainiya, irin su swamps, marshes, da tarkace tafkuna, kuma sun dace da salon rayuwa mai ruwa. Amphiumas masu cin nama ne kuma suna ciyar da abincin da ya ƙunshi kwari, ƙananan kifi, da sauran dabbobin ruwa. Amphiuma na nufin), da amphiuma mai yatsu uku (Amphiuma tridactylum). Amphiumas wasu amfibiya ne na musamman tare da halayen halitta masu ban sha'awa, kuma masana kimiyya suna nazarin su don ƙarin fahimtar ilimin halittu, ilimin halittar jiki, da tarihin juyin halitta.