Comparisons of the head in dorsal (left column), lateral (middle column) and ventral (right column) views of the type series of Siagonodon exiguum sp. nov. A MNHN-RA-2023.0001; B MNRJ 27557; C MNRJ 27558; D MNRJ 27559; E MNRJ 27560; F MNRJ 27561; G MNRJ 27562 (holotype).

  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.