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Boto is a Portuguese name given to several types of dolphins and river dolphins native to the Amazon and the Orinoco River tributaries. A few botos exist exclusively in fresh water, and these are often considered primitive dolphins.

Classification

The botos are a paraphyletic group, defined largely by their evolutionary convergences.

The genus Sotalia is divided into two species. The costero (S. guianensis) is distributed in the Atlantic, from Florianópolis in Santa Catarina, Brazil, and northwards. The tucuxi (S. fluviatilis) lives in the rivers of the Amazon.

Burmeister's porpoise is marine and lives from Santa Catarina to the south.

The Amazon river dolphin (Inia geoffrensis) thrives in fresh water, is endemic to the Amazon basin, and is placed in the Data Deficient category of the IUCN.^[1]

The Araguaian river dolphin (I. araguaiaensis) is a newly identified species native to the Araguaia-Tocantins basin of Brazil.^[2]

The La Plata dolphin (Pontoporia blainvillei), another vulnerable Brazilian denizen, is a marine river dolphin that ranges from Espírito Santo, Brazil, to the south.^[3]

Suborder Odontoceti
- Superfamily Delphinoidea
  - Family Delphinidae
    - Genus Sotalia
      - Species Sotalia fluviatilis, tucuxi
      - Species Sotalia guianensis, costero
  - Family Phocoenidae
    - Genus Phocoena
      - Species Phocoena spinipinnis, Burmeister's porpoise
- Superfamily Platanistoidea
  - Family Iniidae
    - Genus Inia
      - Species Inia araguaiaensis
      - Species Inia geoffrensis
        Subspecies Inia geoffrensis geoffrensis, Amazon river dolphin
        
        Subspecies Inia geoffrensis boliviensis, Bolivian river dolphin
        
        Subspecies Inia geoffrensis humboldtiana, Humboldt's river dolphin
  - Family Pontoporiidae
    - Genus Pontoporia
      - Species Pontoporia blainvillei, la Plata dolphin

References

^ Template:IUCN2012.2 Database entry includes a lengthy justification of why this species is data-deficient.
^ Hrbek, Tomas; Da Silva, Vera Maria Ferreira; Dutra, Nicole; Gravena, Waleska; Martin, Anthony R.; Farias, Izeni Pires (2014-01-22). Turvey, Samuel T. (ed.). "A New Species of River Dolphin from Brazil or: How Little Do We Know Our Biodiversity". PLOS ONE. 9: e83623. doi:10.1371/journal.pone.0083623. PMC 3898917. PMID 24465386.{{cite journal}}: CS1 maint: unflagged free DOI (link)
^ Template:IUCN2012.2 Database entry includes a brief justification of why this species is of vulnerable.

[iucn_Inia_geoffrensis-1] Template:IUCN2012.2 Database entry includes a lengthy justification of why this species is data-deficient.

[Hrbek2014-2] Hrbek, Tomas; Da Silva, Vera Maria Ferreira; Dutra, Nicole; Gravena, Waleska; Martin, Anthony R.; Farias, Izeni Pires (2014-01-22). Turvey, Samuel T. (ed.). "A New Species of River Dolphin from Brazil or: How Little Do We Know Our Biodiversity". PLOS ONE. 9: e83623. doi:10.1371/journal.pone.0083623. PMC 3898917. PMID 24465386.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[iucn_Pontoporia_blainvillei-3] Template:IUCN2012.2 Database entry includes a brief justification of why this species is of vulnerable.

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@@ Line 5: / Line 5: @@
 ==Classification==
-The botos are a Very very small or bi. o get da big kind. Ardell get the square kind. Jdeden get the small kind [[convergent evolution|evolutionary convergences]].
+The botos are a [[paraphyly|paraphyletic]] group, defined largely by their [[convergent evolution|evolutionary convergences]].
 The genus ''[[Sotalia]]'' is divided into two [[species]]. The [[costero]] (''S. guianensis'') is distributed in the Atlantic, from [[Florianópolis]] in [[Santa Catarina, Brazil]], and northwards. The [[tucuxi]] (''S. fluviatilis'') lives in the [[river]]s of the Amazon.