Panacanthus is a genus of conehead katydids found in forests in northwestern South America (western Brazil, Colombia, Ecuador and northern Peru) and Panama, including the western Amazon, the Chocó and the Magdalena River Valley.

These nocturnal katydids are spiny with a horn-like projection on the top of the head and generally have a head-and-body length of about 2.5–7 cm (1.0–2.8 in), excluding the female's ovipositor.

[2] The ovipositor is long, about 4–6.5 cm (1.6–2.6 in), but the relative size varies depending on species; in some it is shorter than the head-and-body and in some it is longer.

They are able to camouflage among the leafy tropical trees because of their unique green color.

Even though they do not have teeth, they are able to shred flesh with the bite of their sharp mouth parts.