If you don't like rants, don't bother reading please.
Lets talk original species.
First lets start with conversation by looking at actual species.
The one on the top is a cuttlefish and the one on the bottom is an octopus.
Both are within the same kingdon, phylum, and class. (Animalia, Mollusca, Cephalopoda) but the sub-order is different, making them seperate species.
Both the octopus and the cuttlefish change color based on environment, can squirt ink, have tentacles, have a hard beak, a mantle, two eyes, 'feeding' arms, and 8 arms. The only real differences are that cuttlefish have an internal cuttlebone, have the little fin around