The lower lobe of the deeply forked caudal fin is longer than the upper lobe. 尾鰭深叉型,下葉比上葉長(cháng)。
Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin. 東半球的淡水鲇魚(yú),體表無(wú)鱗,有類(lèi)似鰻魚(yú)尾鰭的很長(cháng)的臀鰭。