[3] It was first described by Guy Coburn Robson in 1930, based on specimens found in South Georgia.

Robson originally placed Adelieledone polymorpha in the genus Graneledone.

[5] 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.

[6] Adelieledone polymorpha is of moderate size and robust,[7] with a mantle length of up to 60 millimeters, and a total length of up to 200 millimeters.

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