ticks

ticks

A tick, tick or boring is an arthropod of the order of mites, classified in the Ixodidae or Argasidae families. Ectoparasites are bloodsuking, responsible for the transmission of numerous diseases. Fossil records suggest their existence for at least 90 million years, with more than 800 types.

Location

It is widespread throughout the earth in the field and in the city, as the main reason for his action is the human or animal whose blood feeds and is therefore considered hematófago and one of the main vectors of many diseases caused by viruses , bacteria, protozoa and rickettsiae, which transmit diseases to humans and animals.

Some species from 0.25 mm diameter. They live in clumps of grass on the ground, among the woods in wet or dry climates.

Ticks usually have the oval, and when fasting are plans in the dorsal-ventral direction, but after feeding are convex and even spherical.

Its shell is composed of chitin in the form of an exoskeleton, and tough and strong in relation to its thinness.

Types of parasitism 

Ticks family Argasidae not normally remain adhered to the host for extended periods; They spend the majority of time in the environment (hidden in crevices in animal shelters, for example) and the host only seek to feed, usually when they sleep. These ticks are notable for being able to fast for prolonged periods, often more than a year, waiting for the opportunity to feed. Already the family Ixodidae ticks remain
long periods on their hosts. Here, there are two main types of parasitism:

 Ticks of a host, as the tick ox Boophilus microplus, adhere to the host while still in the larval stage, a few days after hatching eggs; after starting parasitism, they grow up with aspect "engorged" perform seedlings reaching adulthood. After the females were fed (engorged) with blood, females fall on the ground and looking for a place to hold protected egg laying. Females produce thousands of eggs dying then.
 Ticks two hosts, where the larval and nymphal stages occur in the same host, but the adult stage a different host.
 Ticks three hosts, as the horse cajennense Amblyomma: These ticks fall to the ground to make the seedlings, rising on a new host then.