Ixodidae (Acari: Ixodoidea): descriptions and redescriptions of all known species from 1758 to December 31, 2019 Guglielmone, Alberto A. Petney, Trevor N. Robbins, Richard G. Zootaxa 2020 2020-11-05 4871 1 1 322 34WNR (Say, 1821) Say 1821 [199,608,1230,1257] Arachnida Ixodidae Dermacentor Animalia Ixodida 146 147 Arthropoda species variabilis  A Nearctic species, but with a few records from the Neotropical Region, whose adults are usually found on Artiodactyla(several families), Carnivora(several families), and Perissodactyla: Equidae; nymphs and larvae are commonly recovered from Rodentia(several families). All parasitic stages have also been collected from Mammalia(several orders) and less often from Galliformes: Phasianidae; immature stages have been found on Caprimulgiformes: Apodidae, Passeriformes(several families), and Squamata: Agamidae.  Dermacentor variabilisis a very frequent parasite of humans.   M: Say (1821), under the name  Ixodes variabilisand given its current status in Banks (1907)  F: Koch (1844a), under the name  Dermacentor electus, a synonym of  Dermacentor variabilis  N: Hooker et al.(1912)  L: Hooker et al.(1912)  Redescriptions  M: Banks (1908), Hooker et al.(1912), Cooley (1938), Brinton et al.(1965), Arthur (1960a), Furman and Loomis (1984), Yunker et al.(1986), Lindquist et al.(2016)  F: Banks (1908), Hooker et al.(1912), Cooley (1938), Brinton et al.(1965), Arthur (1960a), Furman and Loomis (1984), Yunker et al.(1986), Lindquist et al.(2016)  N:Cooley (1938), Brinton et al.(1965), Arthur (1960a), Furman and Loomis (1984), Lindquist et al.(2016), Dubie et al.(2017)  L:Cooley (1938), Clifford et al.(1961), Brinton et al.(1965), Arthur (1960a), Furman and Loomis (1984), Coley (2015), Lindquist et al.(2016), Dubie et al.(2017)