Validation and redescription of Amblyomma romitii Tonelli-Rondelli, 1939 (Acari: Ixodidae)

The current synonymy of Amblyomma romitii Tonelli-Rondelli, 1939, a Neotropical species, with the Oriental species A. extraoculatum Neumann, 1899 is discussed. The type-specimens of both species were examined and their morphological differences determined. Considering their morphology and their different continental origins, we are reasonably certain that both taxa are valid. The type-specimen of A. extraoculatum is a female labelled as being from Singapore. This is the only locality data on this tick species, which does not imply that it is restricted to Singapore. The geographical distribution of A. romitii includes Brazil (state of Pará), French Guiana, British Guiana (now Guyana), Surinam and Venezuela. A redescription of the male and female types of A. romitii, based on light microscopy, is provided. In addition, the relationship of this species with other Neotropical and Asian species of Amblyomma Koch, 1844 is discussed.