Hyperolius leucotaenius
At one time thought to be extinct , in 2011 "Hyperolius leucotaenius" was found and photographed on the banks of the Elila River , a tributary of the Lualaba . 
<triplet> Elila River <subj> Lualaba <obj> mouth of the watercourse <triplet> Lualaba <subj> Elila River <obj> tributary