chigger

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chigger,

minute, six-legged, reddish larva of the harvest mitemite,
small, often microscopic arachnid that belongs to several orders in the subclass Acari (or Acarina), to which the tick also belongs; mites and ticks are related to the spiders.
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, one of various red bugsred bug,
name for various red insects or arachnids. Chief among them are the cotton stainer of the S United States, which pierces the seeds of the cotton plant and discolors the fibers, and the larva of the harvest mite, or chigger, the cause of red-bug dermatitis.
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 widely distributed throughout the world and common in the S United States. Attaching itself by its mouthparts to the skin of its vertebrate host, the chigger injects saliva that destroys cells and may cause an intense irritation known as red-bug dermatitis. The food of the chigger consists of the cellular contents and tissue fluid of the host. Certain Asian species carry minute organisms (rickettsias) that cause scrub typhus, a disease of humans. Chiggers are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Arachnida, subclass Acari, order Trombidiformes, family Trombiculidae.

chigger

[′chig·ər]
(invertebrate zoology)
The common name for bloodsucking larval mites of the Trombiculidae which parasitize vertebrates.