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 Florianopolis in Santa Catarina, Brazil and northwards. The tucuxi (S. fluviatilis) lives in the rivers of the Amazon.
Burmeister's porpoise spinipinnis) is marine and lives from Santa Catarina to the south.
The Amazon river dolphins (Inia geoffrensis) thrive in fresh water, are endemic of the Amazon rivers, and are placed in the vulnerable category of the IUCN.
The la Plata dolphin (Pontoporia blainvillei), another vulnerable Brazilian denizen, is a marine river dolphin that ranges from Espírito Santo, Brazil, to the south.
- Suborder Odontoceti
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- Superfamily Delphinoidea
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- Family Delphinidae
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- Genus Sotalia
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- Species Sotalia fluviatilis, tucuxi
- Species Sotalia guianensis, costero
- Family Phocoenidae
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- Genus Phocoena
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- Species Phocoena spinipinnis, Burmeister's porpoise
- Superfamily Platanistoidea
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- Family Iniidae
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- Genus Inia
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- Species Inia geoffrensis
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- Subspecies Inia geoffrensis geoffrensis, Amazon river dolphin
- Subspecies Inia geoffrensis boliviensis, Bolivian river dolphin
- Subspecies Inia geoffrensis humboldtiana, Humboldt's river dolphin
- Family Pontoporiidae
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- Genus Pontoporia
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- Species Pontoporia blainvillei, la Plata dolphin
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