In 1912 he obtained his doctorate with a dissertation on the vascular system of Octopoda.
2.
Superorder Octopodiformes has modifications to arm pair II; it is significantly reduced and used only as a sensory filament in the Vampyromorphida, while Octopoda species have totally lost that arm pair.
3.
If you want to be pedantic, use Octopodes ( anglicized as Octopods, and actually used in scientific literature to refer to members of the Order Octopoda, again notice that it's Octo "'poda "', not Octopia or something ).
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