ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996
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ISSN 1362-1971 An international journal of the Systematic and Applied Acarology Society, published since 1996 [Aims] [Editors] [Content] [Subscriptions] [Contact details] [Society Homepage] |
Systematic & Applied Acarology (2004) 9, 133-140Structure of sensilla on the palptarsus and the tarsus I of Tetranychus truncatus Ehara (Acari: Tetranychidae)
S. SAKUNWARIN1, G. T. BAKER2 & A. CHANDRAPATYA1
1Department of Entomology, Kasetsart University, Bangkok 10900, Thailand
2
Department of Entomology & Plant Pathology, Box 9775, Mississippi State University, MS, USA 39762Abstract
The structure of sensilla on the palptarsus and tarsus I of Tetranychus truncatus Ehara was examined with light, scanning and transmission electron microscopy. A small, peg-shaped sensillum (solenidion), two elongate sensilla with blunt ends (eupathidia) and three hair-like setae are found on the palptarsus. The solenidion and two eupathidia stained with silver nitrate indicating their porosity and TEM micrographs of these two types showed a hollow seta and dendrites in the lumen. These are characteristics of typical chemosensitive sensilla. The hair-like sensilla lack any staining, which denotes the non-porosity of sensilla and they are solid, having no lumen. These characteristics are typical of mechanosensitive sensilla. The sensilla of tarsus I of T. truncatus are chemoreceptors and mechanoreceptors similar to that occurs on the palptarsus. The two elongate and tapered solenidia with distinct sockets forming part of the duplex setae were stained with silver nitrate which indicated their porosity. The three eupathidia were also stained with silver nitrate, revealing their porosity. These sensilla situated on the palptarsus and tarsus I are the structures for perceiving chemicals in the environment involved in mating, feeding and host plants specificity behaviors of mites.
Key words: Tetranychus truncatus, sensilla, receptors, structure, palptarsus, tarsus I
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Last updated 31 July 2004
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