1. Lungless frog discovered in Borneo

Comment #159189 by mjkawa on April 11, 2008 at 3:02 pm

Maybe im missing something very obvious,
but isnt it possible that this species never evolved lungs?
It was stated that amphibians originally had no lungs, then lungs evolved in amphibians, then this species evolved into lungless, skin breathers.
Do we know that EVERY species of amphibians evolved into having lungs in the first place?
Im certainly no expert on frogs, or amphibians, but it just seemed an obvious question.
Also, kind of nullifies the "forward" "backward" thing.