57. Amblyomma humerale Koch, 1844a .

Neotropical: 1) Bolivia, 2) Brazil, 3) Colombia, 4) Ecuador, 5) French Guiana, 6) Guyana, 7) Peru, 8) Suriname, 9) Trinidad and Tobago, 10) Venezuela (Keirans 1985 b, Guerrero 1996, Robbins et al. 2003, Mastropaolo et al. 2014, Acevedo-Gutiérrez et al. 2020, Binetruy et al. 2020, Guglielmone et al. 2021).

Amblyomma crassum, Amblyomma humerale and Amblyomma sabanerae are morphologically similar taxa, and their separation is sometimes difficult (Guglielmone et al. 2021). See also Amblyomma crassum .

The Paraguayan record of Amblyomma humerale in Berlese (1888) represents, in fact, Amblyomma dissimile, as discussed in Tonelli Rondelli (1939). Neumann (1899) described Amblyomma gypsatum, a synonym of Amblyomma humerale, from specimens allegedly collected in Uruguay but cited a locality that is not found there (Guglielmone et al. 2021). Evans (1947) recorded Amblyomma humerale (as Amblyomma humerli, a lapsus) from Panama, but Fairchild et al. (1966) treated this record as erroneous. Vargas (1955) listed Amblyomma humerale from Mexico, but its presence in that country was not confirmed by Guzmán-Cornejo et al. (2011). Consequently, Paraguay, Uruguay, Panama and Mexico are excluded from the geographic distribution of Amblyomma humerale .