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Journal of Cell Science, Vol 1, 475-498, Copyright © 1966 by Company of Biologists

Submitted on February 8, 1966

Development and Determination of Hairs and Bristles in the Milkweed Bug, Oncopeltus Fasciatus (Lygaeidae, Hemiptera)

P. A. LAWRENCE 1

1 Department of Zoology, University of Cambridge; Department of Biology, Western Reserve University, Cleveland, Ohio, U.S.A.

The term ‘organule’ is proposed as an English equivalent for the German word ‘Kleinorgan’. The different organules on the third sternite of Oncopeltus are described: larvae possess innervated bristles and special sensilla termed ‘chemosensilla’, whereas the adult develops, in addition, a dense population of non-innervated hairs. The hairs, bristles and ‘chemosensilla’ each develop from mother cells which undergo a particular series of differentiative divisions. The course of events is described for each type of organule.

Electron-microscopic studies of the fine structure of the outgrowing hairs are described. As in the outgrowth of a scale, longitudinal arrays of microtubules and bundles of fibres are found in the first cytoplasmic process of the trichogen cell. Experiments show that bristle determination occurs between the onset of the moult and the proliferative cell divisions in the epidermis. The period of hair determination is found to occur later than that of the bristles and to be later than the proliferative cell divisions in the last larval stage.

A discussion of the results includes a review of the knowledge of differentiative divisions concerned in the formation of organules in other groups of insects, and a consideration of Wigglesworth's theory of bristle determination.

Submitted on February 8, 1966


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© The Company of Biologists Ltd 1966