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Tarsal Chemoreceptors of the Housefly and Their Possible Relation to Ddt Toxicity1

1947; Oxford University Press; Volume: 40; Issue: 3 Linguagem: Inglês

10.1093/aesa/40.3.401

1938-2901

Wm. P. Hayes, Yu-Su Liu,

Lepidoptera: Biology and Taxonomy

Chemoreceptive sensilla are associated with the functions of taste and smell. These are found on various parts of the body such as antennae, palpi and tarsi. Those on the tarsi are usually considered to be gustatory in function and in several species of Lepidoptera have been shown to be most sensitive to sugars. Chemoreceptive sensilla are of various types. Those associated with small, slender hairs have delicate walls and are supposed to be receptive to odors and are distinguished as chemoreceptive hairs. They fall in the category of sensilla called sensilla trichodea. Such hairs are innervated by a group of sense cells and not by a single bipolar sense cell as are the trichodea sensilla that are regarded as organs of touch. According to Wigglesworth (1939, p. 150), these thin-walled sensilla have no socket or trichopore at their base. The tormogen cell is often absent although the trichogen cell is usually large and secretes a product that fills the thiri-walled hair. The sense cells are usually many in number and may form clusters of twenty or thirty. They are enclosed in a nucleated coat which is continuous with the neurolemma of the attached nerves. The proximal nerve being the afferent process and distal nerve forms the terminal filament.