Many thanks to Richard Willan, who gave us a fascinating presentation on Nudibranches. The coloured dots on the skirts as can be seen on the Hypselodoris infucata below are poisonous. Apparently if you lick them, they taste like sulphur, yuck!
Also thier bum is in the middle of thier breathing apparatus. Sometimes macro can be a bit too close!
Not sure how we can top that this month!