''Colomesus tocantinensis'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of pufferfish in the family

Tetraodontidae Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species variously called pufferfish, puffers, balloonfish, blowfish, blowies, bubblefish, globefish, swellfis ...

. It is endemic to

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

, where it inhabits the

Tocantins River The Tocantins River ( pt, Rio Tocantins, link=no , , Parkatêjê dialect, Parkatêjê: ''Pyti'' ɨˈti is a river in Brazil, the central fluvial artery of the country. In the Tupi language, its name means "toucan's beak" (''Tukã'' for "toucan ...

basin. It reaches a length of 3.5 cm (1.4 inches) SL. The species was described in 2013 by Cesar R. L. Amaral, Paulo M. Brito, Dayse A. Silva, and Elizeu F. Carvalho based on morphology and genetic evidence, both of which separate it from its congeners ''

Colomesus asellus ''Colomesus asellus'', the Amazon puffer, asellus puffer, South American freshwater puffer or Peruvian puffer is a species of pufferfish confined to the Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mytho ...

'' and '' C. psittacus''.Amaral, Cesar R L et al. “A new cryptic species of South American freshwater pufferfish of the genus Colomesus (Tetraodontidae), based on both morphology and DNA data.” ''PLOS ONE'' vol. 8,9 e74397. 11 Sep. 2013, doi:10.1371/journal.pone.0074397

References

Tetraodontidae Fish described in 2013 Fauna of Brazil {{Tetraodontiformes-stub