Geographic distribution of the hard ticks (Acari: Ixodida: Ixodidae) of the world by countries and territories Author Guglielmone, Alberto A. 0000-0001-5430-2889 guglielmone.alberto@inta.gob.ar Author Nava, Santiago 0000-0001-7791-4239 nava.santiago@inta.gob.ar Author Robbins, Richard G. 0000-0003-2443-5271 robbinsrg@si.edu text Zootaxa 2023 2023-03-07 5251 1 1 274 http://dx.doi.org/10.11646/zootaxa.5251.1.1 journal article 235222 10.11646/zootaxa.5251.1.1 43227427-a867-4744-9e4c-2b2302524890 1175-5326 7704190 3326BF76-A2FB-4244-BA4C-D0AF81F55637 208. Ixodes scapularis Say, 1821 . Nearctic: 1) Canada , 2) Mexico (north), 3) USA ; Neotropical: 1) Mexico (south) ( Keirans et al. 1996 a , Guzmán-Cornejo & Robbins 2010, Lindquist et al. 2016 , Guglielmone et al. 2021 ). Several records of Ixodes scapularis have been published under the name Ixodes dammini , a synonym of Ixodes scapularis ( Camicas et al. 1998 , Keirans & Robbins 1999 ), but Ixodes dammini is still treated as valid in Kassiri & Nasirian (2021) and Nasirian & Zahirnia (2021) , among others. Records of Ixodes scapularis from the Neotropical portion of Mexico are treated as provisionally valid in Guglielmone et al. (2021) .