Ticks are parasitic arachnids that are part of the mite superorder Parasitiformes. Adult ticks are approximately 3 to 5 mm in length depending on age, sex, species, and "fullness". Ticks are external parasites, living by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. The timing of the origin of ticks is uncertain, though the oldest known tick fossils are from the Cretaceous period, around 100 million years old. Ticks are widely distributed around the world, especially in warm, humid climates. Ticks belong to two major families, the Ixodidae or hard ticks, and the Argasidae, or soft ticks. Nuttalliella, a genus of tick from southern Africa is the only member of the family Nuttalliellidae, and represents the most primitive living lineage of ticks. Adults have ovoid/pear-shaped bodies which become engorged with blood when they feed, and eight legs. Their cephalothorax and abdomen are completely fused.

Read more in the app

Black-legged tick genome deciphered

25 Best Tick Preventions for Dogs in 2023

20 Best Flea and Tick Treatments for Dogs in 2023

A Looming Problem – Longhorned Tick Discovered in Northern Missouri

Tick-borne pathogens increasingly widespread in Central Canada

Ticked off: New device may offer a better way to prevent tick bites

Prescribed fire could reduce tick populations and pathogen transmission

Longhorned tick discovered in northern Missouri

Hey suburbanites, meet the neighbors. . .tick-carrying white-tailed deer

How Does a Tick Bite Cause Meat Allergies? A Study Provides New Genetic Insights

Which Dog Flea and Tick Control is the Best?

Best Flea and Tick Cures for Dogs

20 Best Flea and Tick Shampoos for Dogs

20 Best Dog Flea and Tick Prevention Products in 2022

12 Best Flea and Tick Medicines for Dogs in 2022

The Quest for a 'Tick Map'

Powassan Virus Kills Woman, 2nd Such Tick-Borne Infection In Connecticut In 2022

This Tick Can Make You Allergic to Meat, and It's Spreading

Tick-borne illnesses are on the rise. Here’s how to protect yourself.

The Tick That Causes a Meat Allergy Is on the Move