Deeply notched cordiform tongues are found in P. leonhardschultzei and P. schmidtorum; with the exception of these two species, some individuals of all species have emarginate tongues.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
The zooecia are very slender and almost cylindrical; they are slightly emarginate and furrowed, the keel in which the furrow runs being sometimes prominent.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale
They are never emarginate or furrowed.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale