|
= endemic EX = extinct or assumed extinct

Genus
Boiruna (Southern Snake Eaters) |
 |
 |
  |
| 
Calamodontophis paucidens
Southern Forest Snake | 
Achaval & Olmos 2003
Carreira & Lombardo 2008
Carreira & Maneyro 2015
Carreira & Meneghel 2003
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Lombardo & Achaval-Coppes 2012
Carreira, Meneghel & Achaval 2005
Franco, Carvalho-Cintra & Lema 2006
Franco, Salomao, Borges-Martins, Di-Bernardo, Meneghel & Carreira 2001
 |
  |
| 
Chironius gouveai
Uruguayan Sipo | 
Achaval & Olmos 2003 [as bicarinatus]
Achaval-Elena-2001 [as bicarinatus]
Carreira & Maneyro 2015 [as bicarinatus]
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012 [as bicarinatus]
Carreira, Meneghel & Achaval 2005 [as bicarinatus]
Dixon, Wiest & Cei 1993 [as bicarinatus]
Entiauspe-Neto, Lyra, Koch, Quintela, Abegg & Loebmann 2020
Peters & Orejas-Miranda 1970 [as bicarinatus]
 |
Genus
Dibernardia (East South American Leaf-litter Snakes) |
 |
 |
Genus
Dipsas (Neotropical Snail Eaters) |
 |
 |
  |
| 
Dryophylax hypoconia
Southern Mock Viper | 
Achaval & Olmos 2003
Achaval-Elena-2001
Carreira & Maneyro 2015
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Meneghel & Achaval 2005
Giraudo & Scrocchi 2002
Trevine, Caicedo-Portilla, Hoogmoed, Thomas, Franco, Montingelli, Osorno-Munoz & Zaher 2021
 |
Genus
Helicops (South American Keelbacks) |
 |
 |
Genus
Lygophis (South American Striped Ground Snakes) |
 |
 |
Genus
Mesotes (Southern Mock Vipers) |
 |
 |
Genus
Phalotris (South American Collared Snakes) |
 |
 |
  |
| 
Phalotris lemniscatus
Southern Black-sided Collared Snake | 
Achaval & Olmos 2003
Carreira & Maneyro 2015
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Meneghel & Achaval 2005
Golay, Smith, Broadley, Dixon, McCarthy, Rage, Schatti & Toriba 1993
 |
Genus
Tantilla (American Centipede Snakes) |
 |
 |
Genus
Xenodon (Northern Mock Lanceheads and South American Hognose Snakes) |
 |
 |
Family
Elapidae [part 1: terrestrial species] (Cobras, Mambas, etc.) |  |  |
Genus
Epictia (Neotropical Thread Snakes) |
 |
 |
  |
| 
Epictia munoai
Rio Grande do Sul Thread Snake | 
Achaval & Olmos 2003
Achaval-Elena-2001
Carreira & Maneyro 2015
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Meneghel & Achaval 2005
Francisco, Pinto & Fernandes 2012
Hahn 1980
Martins, Koch, Pinto, Folly, Fouquet & Passos 2019
McDiarmid, Campbell & Toure 1999
Peters & Orejas-Miranda 1970
Wallach 2016
 |
  |
| 
Bothrops alternatus
Urutu | 
Achaval & Olmos 2003
Achaval-Elena-2001
Campbell & Lamar 2004
Carrasco, Grazziotin, Farfan, Koch, Ochoa, Scrocchi, Leynaud & Chaparro 2019
Carreira & Maneyro 2015
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Meneghel & Achaval 2005
David, Dobiey & Vogel 2018
 |
  |
| 
Bothrops pubescens
Pampas Lancehead | 
Achaval & Olmos 2003
Achaval-Elena-2001
Campbell & Lamar 2004
Carrasco, Grazziotin, Farfan, Koch, Ochoa, Scrocchi, Leynaud & Chaparro 2019
Carreira & Maneyro 2015
Carreira, Brazeiro, Camargo, Rosa, Canavero & Manyro 2012
Carreira, Meneghel & Achaval 2005
David, Dobiey & Vogel 2018
Silva & Rodrigues 2008
 |
| |