None has a distinct cream-colored, crescent-shaped mark bordered Posteriorly by a dark brown bar or triangle, as in the other species in the Ptychohyla euthysanota group.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
No striping on dorsal surface of snout; pale postocular stripe with thick, black borders immediately behind eye; width of black borders equal to approximately one-half width of pale postocular stripe; dorsal surface of soft parts of body with indistinct markings that are larger on hind limbs; plastron and ventral surface of soft parts of body without markings; small dark spots Posteriorly along ventral edge of carapace; pale margin of carapace lacking markings or having few small black spots; carapace circular with or without pattern of large spots.
"Description of a New Softshell Turtle From the Southeastern United States"
Robert G. Webb
The opening is the entrance to a canal that runs Posteriorly above the tooth-row throughout the length of each specimen.
"Two New Pelycosaurs from the Lower Permian of Oklahoma"
Richard C. Fox