This species is known only from around 335m asl in Tepalcatepec Valley (the western extension of the Balsas Basin) in Michoacán State, Mexico. However, although it does not occur along the Michoacán coast, it is likely to be widespread in the Balsas Basin (Duellman 1961; Mendelson et al. 2005).
Habitat and Ecology
It is known from grassy areas with areas of mesquite shrub, numerous reddish rocks and barren areas. Breeding choruses were noted in muddy ditches and flooded grass fields after heavy rains in June and August (Duellman 1961). This species is presumed to be a larval developer.
There is no information available on its population status.
Although it is believed likely to be quite tolerant of disturbance such as cattle ranching, severe habitat alteration and agricultural chemicals could be detrimental to it.
This species is not known from any protected areas.
This species has recently been separated from Incilius coccifer by Mendelson et al. (2005).
Joseph Mendelson 2006. Incilius pisinnus. In: IUCN 2014