I find the whole "octopus ancestry" to be bullshit. Glukkons are clearly vertebrates. The basic vertebrate morphology is very plastic, but it is all present and accounted for within the Glukkon form. Octopuses, however, are molluscs, and I can see absolutely no homologous structures shared between them. Besides, vertebrates are deuterostomes, and molluscs are protostomes. They couldn't be more different and still be within the Eumetazoa.
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