Graneledone verrucosa (image) Field Museum Share Print E-Mail Caption The distribution of warts on the arms and mantle of two octopus species has been identified as a means of telling those species apart. Credit Photo courtesy of the National Oceanic and Atmospheric Association. Usage Restrictions Please include credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.