Correct! They're pretty interesting creatures, to say the least -- a paedomorphic species that spends its life around the tufa outcrops of a saline high-altitude crater lake.
If it's shaped like a hingeback and angles like a hingeback - it must be a hingeback. duh.
I think I've become too accustomed to the shells of poorly kept captive over the years.
Nice pic.
Hey GER - as to the wrong part - happens all the time, ask my 14 year old...LOL