Adelieledone polymorpha, or the Antarctic knobbed octopus, is a species of octopus found in the Antarctic. It was first described by Guy Coburn Robson in 1930, based on specimens found in South Georgia. 
Taxonomy.
Robson originally placed "Adelieledone polymorpha" in the genus "Graneledone". It was then placed in the genus "Pareledone", but was moved to the genus "Adelieledone" in 2003. Robson also split "Adelieledone polymorpha" into two varieties, "oblonga" and "affinis"; that distinction was removed in 2003 as it was likely a result of deformation and misclassification of specimens.
Description.
"Adelieledone polymorpha" is of moderate size and robust, with a mantle length of up to 60 millimeters, and a total length of up to 200 millimeters.