Schematic illustrations (upper line) and photos (lower line) of the asulcate (left) and sulcate (right) sides of the hemipenis of Siagonodon exigumm sp. nov. (MNRJ 27560).

  Part of: Martins A, Folly M, Ferreira GN, Garcia da Silva AS, Koch C, Fouquet A, Machado A, Lopes RT, Pinto R, Rodrigues MT, Passos P (2023) An evolutionary paradox on threadsnakes: Phenotypic and molecular evidence reveal a new and remarkably polymorphic species of Siagonodon (Serpentes: Leptotyphlopidae: Epictinae) from Amazonia. Vertebrate Zoology 73: 345-366.