I ordered a new octo from Live Aquaria which I received on Dec 27th, so I have had him for just over 1 week. I am pretty sure it is an Abdopus aculeatus. He has been interactive and diurnal from Day 1. His mantle is about 2 inches long and his longest arms are 4-5 inches long. He has eaten both live crabs (2) and two pieces of frozen shrimp since I have had him. I am pretty sure it is a male based on him keeping his 3rd leg CCW from his mantle curled most of the time. As yet I have not named him (being superstitious) and want to wait until after he is through the 2nd week. I will say he seems to be acclimating very well so far.