This species occurs in Paraná, Santa Catarina, and Rio Grande do Sul, Brazil, 100-1200 masl.
Habitat and Ecology
It occurs on low bushes surrounding large permanent lakes in open areas.
Breeding occurs in the hot and rainy season and males call from the floating vegetation, generally in permanent ponds. The reproductive mode is probably by means of eggs and exotrophic tadpoles in lentic water (Toledo et al., 2007).
It seems to be an abundant species (Toledo et al., 2007).
It is threatened by water pollution.
It occurs in Caxambu State Park, Paraná. It is listed as Vulnerable for Rio Grande de Sul state’s list of threatened species.
Some populations formerly considered under Sphaenorhunchus surdus are now allocated to the recently described Sphaenorhynchus caramaschii (Toledo et al., 2007).
Luis Felipe Toledo 2008. Sphaenorhynchus surdus. In: IUCN 2014