Relatively slow, this shark swims with strong eel-like (anguilliform) undulations of its body. The body is very long, anguilliform, without scales. They move with typical anguilliform swimming motions and can swim forwards and backwards. The style of swimming was thunniform, unlike more basal ichthyosaurs whose swimming was anguilliform. It is generally thought that anguilliform swimming is less efficient than carangiform swimming. Within the family Clariidae, body forms range from fusiform (torpedo-like) to anguilliform (eel-like). The slender lungfish has an anguilliform body, much like an eel.