Ixodid (Hard Ticks)
This is a ventral view of the anterior end of a female longhorned tick or bush tick, Haemaphysalis longicornis. Note the laterally projected second palpal segments and the prominent spurs on the first pair of coxae (Specimen kindly provided by Dr. Anne Zajac, Virginia Tech).
Ixodes scapularis is known as the black-legged tick or deer tick. This tick is found in the northeastern, upper Midwest, and throughout the southern and south-central United States. Differences in host preferences for immature stages in northern and southern ranges of this tick influence the occurrence and epidemiology of anaplasmosis and Lyme disease in the United States.
Cow infested with Rhipicephalus annulatus, the one-host 'cattle fever tick.' An important vector of Babesia bovis, Babesia bigemina, and Anaplasma marginale, an eradication effort against this tick began in 1906 and by 1943, it was eliminated from the United States, outside of a small quarantined area on the USA-Mexico border.
Argasid (Soft Ticks)
Otobius megnini Nymph of Otobius megnini, the spinose ear tick. Larvae and nymphs feed in the external ear canal of ruminants and horses; these ticks are also sometimes found infesting camelids, small animals, and even humans. The adults are free-living and do not feed. Note the short spines covering the surface of the tick.