part_of adult Haller's organ adult Haller's organ anterior pit A depression on the dorsal surface of the tarsus of leg I located distal to the posterior capsule. The anterior pit is usuallysurrounded by a prominent ridge. In most ixodid ticks, the anterior pit contains 6 or 7 setiform sensilla, including one or moremultiporose sensilla serving as olfactosensilla, tip pore that serve as gustatory sensilla and still others that are grooved fine andno-pore sensilla that are probably mechanosensilla. At least one of the tip pore setae is a multifunctional sensilla. In Rhipicephalus (= Boophilus) microplus, 3 of the anterior pit sensilla are grooved double-walled porous sensilla with the pores in the grooves while other lackpores. In argasid ticks, the anterior pit typically contains 9 sensilla, although the number is variable among the species. Several multiporose olfactosensilla are recognized, along with grooved sensilla and no-pore mechanosensory setae. Fig. 4-22, Fig. 4-23, Fig. 4-24, Fig. 15-10, Fig. 15-11, Fig. 15-12, Fig. 15-13, Fig. 15-14, Fig. 15-15, Fig. 15-18, in Biology of Ticks ISBN:0-19-505910-7. TADS:0000289 TADS:0000289 default_namespace