Don't know if everyone here attends the ICPS forum, but if not, there has been a very interesting discussion about the taxonomy of tentaculata and hamata. I invite whoever is interested to see this thread:
Dave Evans's posts on the second page are a conversation he and I had been having via PMs, so my apologies, as it is a bit hard to tell who is writing what. Really, you have to just look at the beginning of the posts to see if they start with "Hi Dave" or "Hi Ron" to figure out who wrote what.
For a bit of clarification, when I was mentioning the lid hairs on the two species, they both do possess lid hairs, but it is my understanding that the hairs of hamata are a little different. Dave did mention in one of his PMs (I think) that the lid hairs of hamata branch out to 3 different ends.