Abstract
THE pore canals of the larval cuticle of Hypoderma bovis are extremely conspicuous. When the cuticle is treated with saturated potassium hydroxide solution followed by iodine and sulphuric acid1, they are seen to be occupied by helical strands of chitosan 2–3µ thick, which give a much stronger reaction than the remainder of the cuticle. The helical nature of the canals is readily seen in a horizontal optical section. On changing the plane of focus the optical section of the canal clearly described a circular path. The diameter of the helix is about 5µ and in vertical sections its pitch is seen to be about 6µ. There is no relation between the pitch of the helix and the spacing of the laminæ of the cuticle. Between 5 and 6 laminæ are transversed by one complete turn of the helix (Fig. 1).
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References
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KENNAUGH, J. Pore Canals in the Cuticle of Hypoderma bovis (Diptera). Nature 205, 207 (1965). https://doi.org/10.1038/205207a0
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DOI: https://doi.org/10.1038/205207a0
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