Original: See also Cephalopod intelligence Cephalopod size Kraken Notes References Further reading Felley , J. , Vecchione , M. , Roper , C. F. E. , Sweeney , M. & Christensen , T. , 2001-2003 : Current Classification of Recent Cephalopoda .
Simplified: Felley , J. , Vecchione , M. , Roper , C. F. E. , Sweeney , M. & Christensen , T. , 2001-2003 : Current Classification of Recent Cephalopoda .