Taxonomic notes: The species was revalidated by Caramaschi and Cruz (2002).

This species is known from the municipalities of São Lourenço do Sul, Porto Alegre, São Jerônimo, Dom Feliciano and Caçapava do Sul, in the state of Rio Grande do Sul, Brazil, and from Cuchilla de Mangrullo, department of Cerro
Largo, Uruguay (José Langone pers. comm. June 2009). It is known to occur at approximately 50 m asl.

This species was recently rediscovered and is considered to be relatively common in southern Brazil (Vaz-Silva et al. 2008).

It occurs in a seasonally inundated habitat. It presumably breeds in water by larval development, like other species of its genus.

There
are no reports of this species being utilized.

Rice farming may possibly be a threat to its habitat.

• 2.1.2 Small-holder farming

It is not known to occur in any protected areas.

• 2.1 Site/area management
• 1.1 Site/area protection

Listed as Least Concern in view of its wide distribution, presumed
large population, and because it is unlikely to be declining to
qualify for listing in a more threatened category.

• Borteiro, C., Kolenc, F., Tedros, M. and Gutierrez, F. 2005. Melanophryniscus pachyrhynus [Geographic distribution]. Herpetological Review 36(2): 199-200.
• IUCN. 2004. 2004 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 23 November 2004.
• Vaz-Silva, W., Balestrin, R.L. and Di-Bernardo, M. 2008. Rediscovery of Melanophryniscus pachyrhynus (Miranda-Ribeiro, 1920) (Amphibia: Anura: Bufonidae) in southern Brazil, with addenda to species redescription. South American Journal of Herpetology 3(1): 36-42.