[1] E. gryllus has not been recorded from Carite State Forest since 2016, prior to Hurricane Maria's landfall.

It is also believed to be extirpated from Cordillera Central State Forest.

The population in El Yunque National Forest is likely in decline.

E. gryllus has disappeared from lower elevations, but was formerly found between 39 and 1,045 metres (128 and 3,428 ft) above sea level.

[1] Threats that may be affecting this critically endangered species include deforestation, chytridiomycosis, climate change, including hurricane damage to habitat, and invasive species.