Definition: A genus of hard ticks (family Ixodidae), many species of which are parasitic on humans and animals; they are characterized by an anal groove surrounding the anus anteriorly, absence of eyes and festoons, and marked sexual dimorphism; about 40 species have been described from North America.
[G. ixōdēs, sticky, like bird-lime, fr. ixos, mistletoe, + eidos, form]
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