The Voiceless Treefrog was described in 1968, it was restricted to the western slope of the Cofre de Perote Mountain in the Sierra Madre Oriental in central Veracruz, Mexico, where the frogs inhabited dry pine forests spending the days hidden in crevices and under rocks behind small cascades of mountain streams.
The species reached a length of 4 to 5 cm, with the females being slightly larger than the males
The Voiceless Treefrog was once abundant but has not been seen since around 2010 and is now feared to have gone extinct.
The San Martin Pygmy Salamander was described in 1955 when the species was still very common.
The species was endemic to lowland forests at the foothills of the San Martin Tuxtla volcano in the Sierra de los Tuxtlas in southern Veracruz, Mexico, it inhabited the leaf-liiter on the ground and was also found under rotten logs and especially under fallen bromeliads.
San Martin Pygmy Salamander was not found since the 1980s and is now most likely extinct.
The Admirable False Brook Salamander is known exclusively from a single specimen that was found in 1954 (or 1940 according to other sources).
This very small species, which reached a total length of only about 6,5 cm, inhabited the tropical humid forest at a small place named as Hacienda El Potrero near the city of Cordoba, a city that since of course has largely increased its expansion.
The Admirable False Brook Salamander was never found since, despite intensive searches, and is most likely extinct.