Some of my finds revising the anatomy of the Hydrophiloidea are recorded in my blog (chronologically):
http://acidocerinae.blogspot.com/2016/10/what-am-i-missing.html
http://acidocerinae.blogspot.com/2017/04/im-on-my-way.html
http://acidocerinae.blogspot.com/2017/09/so-where-to-stop.html