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Hanrahan, S.A. and Nicolson, S.W. 1987. Ultrastructure of the malpighian tubules of Onymacris plana plana peringuey (Coleoptera : Tenebrionidae). International Journal of Insect Morphology and Embryology, 16(2): 99–119


Description:

Ultrastructure of the malpighian tubules of Onymacris plana plana peringuey (Coleoptera : Tenebrionidae).

Summary / Notes:

The structure of the free segment of the malpighian tubules of Onymacris plana plana Peringuey (Coleoptera : Tenebrionidae) has been examined to complement observations on tubule activity (Nicolson and Hanrahan, 1986). O. plana lives in arid conditions in the Namib desert and may be subject to periods of desiccation and to fogs when humidity is high. Cell structure of malpighian tubules from the following were examined; beetles from the field, beetles kept in humid and arid laboratory conditions, in vitro tubule preparations treated with substances such as CAMP and corpora cardiaca extract. The free segment is composed of a longer yellow distal region and a shorter colourless proximal region. Type 1 and Type 2 cells were present in the distal region, the latter being few in number, irregular in shape, and relatively small. Type 1 cells varied in appearance when the tubules were exposed to different conditions. Laminate spheres were common in these cells when the beetles had been desiccated, either under laboratory or field conditions. Few were present in the tubules of insects kept in water balance. Exposure to dilute Ringer or cAMP caused the channels between the basal infoldings to widen. Exposure to extracts of brain or corpora cardiaca containing diuretic hormone did not have this effect. In dehydrated beetles, the laminate spheres did not disappear when the tubules were treated with diuretic hormone. Type 1 cell structure is influenced by the conditions that the beetle experiences. Keywords: Type I and Type 2 cells, laminate spheres, diuretic hormone, CAMP, desiccation.

Year: 1987

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/0020732287900110


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Hanrahan, S.A. and Nicolson, S.W. 1987. Ultrastructure of the malpighian tubules of Onymacris plana plana peringuey (Coleoptera : Tenebrionidae). International Journal of Insect Morphology and Embryology, 16(2): 99–119
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