We describe a case of dicephalism in a yellow anaconda snake, Eunectes notaeus, from southern Pantanal, Brazil. The specimen exhibits two heads and two long necks, which are united on the anterior third of the body. Two hearts, three lungs, two livers, and two stomachs are also present. The left heart is larger and more cranial than the right heart although they are in the normal position. Radiographs revealed approximately 64 vertebrae in the right neck, 57 in the left neck, eight in the fusion zone, 202 in the trunk, and 52 in the tail. According to the classification adopted in the present study the specimen herein described is a proarchodichotomous specimen. This is the first record of dicephalism in Eunectes. Further, this snake represents the 28th documented case of dicephalism within the family Boidae and the 1088th case in snakes.
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Univ Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, Brazil
Bulau, Sandra Eloisa
Pecanha, Willian Thomaz
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Univ Fed Rio Grande do Sul, Dept Genet, Programa Posgrad Genet & Biol Mol, Av Bento Goncalves 9500,CP 15007, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, Brazil
Pecanha, Willian Thomaz
Martins-Ferreira, Claiton
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机构:Univ Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, Brazil
Martins-Ferreira, Claiton
de Freitas, Thales Renato Ochotorena
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Univ Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, Brazil
Univ Fed Rio Grande do Sul, Dept Genet, Programa Posgrad Genet & Biol Mol, Av Bento Goncalves 9500,CP 15007, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, Predio 4343, BR-91540000 Porto Alegre, RS, Brazil
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Univ Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, BrazilUniv Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, Brazil
Silva Santos, Juan Jethro
Carvalho, Yuri Bovi
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Univ Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, BrazilUniv Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, Brazil
Carvalho, Yuri Bovi
de Alcantara Lopes, Diogo Luiz
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Univ Fed Rio Grande, Lab Piscicultura Estuarina & Marinha, Codigo Postal 474, BR-96201900 Rio Grande, RS, BrazilUniv Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, Brazil
de Alcantara Lopes, Diogo Luiz
Romano, Luis Alberto
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Univ Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, BrazilUniv Fed Rio Grande, Lab Patol Organismos Aquat, Codigo Postal 474, BR-96201900 Rio Grande, RS, Brazil