Ticks are commonly thought of as insects, they are actually arachnids like scorpions, spiders and mites. All members of this group have four pairs of legs as adults and have no antennae.
The remaining two families contain the hard ticks (Ixodidae) and the soft ticks (Argasidae). Ticks are closely related to the numerous families of mites, within the subclass Acarina (see article: Mites of livestock). The Ixodidae include over 700 species. Ticks are vectors of a number of diseases that affect both humans and other animals. Despite their poor reputation among human communities, ticks may play an ecological role by ailing infirm animals and preventing overgrazing of plant resources. There are thirteen known species of ticks in Minnesota. The majority of these species are known as hard ticks, i.e. they have a relatively hard body and possess a plate-like shield, or scutum (Figure 1), behind the head. Blacklegged ticks (formerly known as deer ticks) can potentially transmit the disease organisms that cause Lyme disease, human anaplasmosis (formerly known as human granulocytic ehrlichiosis), babesiosis, and Powassan encephalitis. Although at least 15 species of ticks occur in Illinois, only a few of these ticks are likely to be encountered by people: American dog tick, lone star tick, blacklegged (deer) tick, brown dog tick and winter tick. There are two groups of ticks, sometimes called the hard ticks and soft ticks. Hard ticks, like the common dog tick, have a hard shield just behind the mouthparts (sometimes incorrectly called the head); unfed hard ticks are shaped like a flat seed. 1 Although commonly referred to as insects, ticks are technically arachnids. 2  Ticks are classified as parasites since they all feed on the blood of host animals. 3  Tick species number in the hundreds, but only a handful typically transmits disease to humans. Ticks. Like mosquitoes, ticks are vectors, or transmitters, of disease. Though extremely serious, mosquito-borne disease affects only a few thousand individuals in the US each year, while tick-borne disease afflicts tens of thousands. Unlike mosquitoes, ticks do not grab a blood meal and go on their way. Adult black-legged ticks are rarely found on humans, but they do feed on dogs and cats. Nymphs appear to be the main vectors of Lyme disease to humans and pets. Nymphs are approximately the size of a poppy seed and are therefore almost never seen by a human. You are encouraged to learn more about the biology of ticks in Indiana. This will enable you to make more informed decisions about health risks, avoid contact with ticks, decide whether to attempt tick control, and determine how to conduct control when deemed necessary. Two families of ticks, Ixodidae (hard ticks) and Argasidae (soft ticks), are important to humans because of the diseases or illnesses they can transmit or cause. Hard ticks have a tough back plate or scutum that defines their appearance. The hard ticks tend to attach and feed for hours to days.  Although ticks are commonly thought of as insects, they are actually arachnids like scorpions, spiders and mites. All members of this group have four pairs of legs as adults and have no antennae. Adult insects have three pairs of legs and one pair of antennae. There are two groups of ticks, sometimes called the hard ticks and soft ticks. Hard ticks, like the common dog tick, have a hard shield just behind the mouthparts (sometimes incorrectly called the head); unfed hard ticks are shaped like a flat seed. The tick is often mistaken as an insect but is actually a small arachnid. Ticks are external parasites (ectoparasites) that feed on the blood of mammals, birds, some reptiles and amphibians. The term for diet consisting of only blood is called hematophagy.  Ticks are well known bloodsucking external parasites of humans, pets, livestock, and wild animals. They also are vectors of a wide variety of disease-causing organisms to animals and are second only to mosquitoes in terms of public health importance. You are encouraged to learn more about the biology of ticks in Indiana. This will enable you to make more informed decisions about health risks, avoid contact with ticks, decide whether to attempt tick control, and determine how to conduct control when deemed necessary. Ticks are small arachnids in the order Parasitiformes. Along with mites, they constitute the subclass Acarina. Ticks are ectoparasites (external parasites), living by hematophagy on the blood of mammals, birds, and sometimes reptiles and amphibians. Ticks are vectors of a number of diseases that affect both humans and other animals. Despite their poor reputation among human communities, ticks may play an ecological role by ailing infirm animals and preventing overgrazing of plant resources.
https://en.wikipedia.org/wiki/Tick http://www.extension.umn.edu/garden/insects/find/ticks-and-their-control/ http://www.idph.state.il.us/envhealth/pccommonticks.htm https://www.mosquitosquad.com/bugs-disease/ticks/ http://extension.entm.purdue.edu/publichealth/insects/tick.html http://www.emedicinehealth.com/ticks/article_em.htm http://www.idph.state.il.us/envhealth/pccommonticks.htm http://www.desertusa.com/insects/tick.html http://extension.entm.purdue.edu/publichealth/insects/tick.html https://en.wikipedia.org/wiki/Tick
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