Ed, have you had personal experience with Typhlonectinae besides T natans?
I find the Typhlonectinae very interesting and would love to be able to start to develop a collection of them, but due to their unavailability, tank size constraints, and conflicting temperatures between Gymnophiona needs and Caudata needs, it isn't really possible. I will continue to try though.
I have heard of Chthonerpeton possibly being imported once in the 80's, but that is all. I'd like to know if any aquatic caecilians besides T natans have been imported or still do occasionally show up.
Finally, I noticed on AmphibiaWeb there is a description of Atretochoana. It sounds the most intriguing due to Nussbaum and Wilkinson's assumptions: a cold water, lungless, stream-dwelling caecilian.