Haller's organ

Haller's organ

[′hal·ərz ‚ȯr·gən]
(invertebrate zoology)
A chemoreceptor on the tarsus of certain ticks.
References in periodicals archive ?
Haller's organ is a minute cavity at the terminal segment of the first pair of a tick's legs and is composed of a pit and a capsule that contain sensory setae with numerous chemoreceptors designed to target the carbon dioxide (C[O.
Haller's organ in the tick family Argasidae (Acari: Parasitiformes: Ixodida).
1975) and in Anactinotrichida, the well known Haller's Organ on tarsus I of Ixodida and Holothyrida and the telotarsal organ on tarsus I of Opilioacarida (summarized by Alberti & Coons 1999; Coons & Alberti 1999).
Single-walled sensilla with plugged wallpores are present in the capsule of Haller's organ (Foelix & Axtell 1972).
However, some main differences between Haller's organ of Ixodida and the tarsal organ of ricinuleids are evident.
The larva of a questing tick waves its front legs back and forth, checking the level of carbon dioxide in the air with its Haller's organs.