R. S. Ogden , A. L. Allcock , P. C. Wats & J. P. Thorpe

South African Journal of Marine Science, 1998, 20:1, 29-36, doi:10.2989/025776198784126476

The role of beak shape in octopodid taxonomy

PCA and discriminant analysis on morphological measurments of beak shape in octopolids. Geneera could be distinguished but not species.