I can't help with the name but I can say it looks good, brains look different at different times of the day. So long as the flesh gets puffy and has no skeleton poking through the top of it, that's what you want. You will see feelers come out of the center sometimes too. Mine will open up and put out feelers right after I feed it reef roids. I'm not sure if that means it's still hungry, maybe someone else can chime in on that but it does look a lot different that it usually looks. At night it shrivels but after my lights have been on for an hour or so it looks normal again.
Also if you use a siphon hose to clean your sand bed, keep it away from that brain because it'll suck right into the hose if you get too close.
