Key Identification Features
- Engystomops petersi forms the northwestern clade of the genus Engystomops, and is recognized as a distinct species found in northern Peru and Ecuador.
- Its karyotype is unique compared to other Engystomops species in the area, and it is especially distinct from the southwestern clade E.
- Dorsal folds are absent, while dorsolateral folds are indistinct or most often absent; lateral folds are also either absent or interrupted.
- This species produces three distinct advertisement calls: growls, grunts, and trills; growls are the most frequent call type.
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