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An ultrastructural study of the eye of Gomphiocephalus hodgsoni, a collembolan from Antarctica

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Abstract

The collembolan Gomphiocephalus hodgsoni is one of a few hexapods occurring in Antarctica. Male and female individuals do not differ with regard to their eyes. Both possess eight single-lens eyes. In the adults, each lens has a diameter of 10–12 μm and covers an almost spherical crystalline cone made up of four unequal moieties. When we accepted homogenous refractive indices, known from pterygote insect eyes, and then calculated the focal length of the dioptric apparatus, we found that light could be focused on the retina. The retinal cells of each eye are grouped in two tiers and surround the centrally fused rhabdom. Rhabdomeric microvilli, approximately 1.3 μm long, possess a diameter of 80 nm and are typically aligned in one direction. More proximally, however, two rhabdomeres with microvilli perpendicular to the larger, more distal, rhabdom appear. Signs of light-induced damage, despite the bright summer radiation in Antarctica, were not seen. Ricegrain-like screening pigment granules, measuring 0.8×0.45 μm in dimensions, densely surround each rhabdom and shield the cytoplasm of the surrounding cells. The orthogonal arrangement of the microvilli suggests that G. hodgsoni could be sensitive to light-polarization. This ability might be of importance in detecting tiny amounts of meltwater in close proximity to the insect.

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Acknowledgements

V.B.M.-R. is grateful for the funds received from the Waikato Antarctic Research Unit (WARP) to start this research and to the staff of the DSIR-Antarctic Division (New Zealand) for the support and hospitality received at Scott Base. W.A. Reid thanks the Chilean Antarctic Programme and V.B.M.-R. is indebted to the Hapag Lloyd company for arranging their additional respective trips to Antarctica. All authors acknowledge the support given to them by the International University Bremen (IUB).

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Authors and Affiliations

  1. Faculty of Engineering and Science, International University Bremen (IUB), P.O. Box 750561, 28725, Bremen, Germany

    Victor Benno Meyer-Rochow & Jozsef Gal

  2. Electron Microscopy Unit, University of the West Indies, Mona Campus, Kingston 7 (St. Andrew), Jamaica, West Indies

    Walton A. Reid

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  1. Victor Benno Meyer-Rochow
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  2. Walton A. Reid
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  3. Jozsef Gal
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Correspondence to Victor Benno Meyer-Rochow.

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The order of the authors’ names reflects the sequence in which the individuals joined in this project.

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Meyer-Rochow, V.B., Reid, W.A. & Gal, J. An ultrastructural study of the eye of Gomphiocephalus hodgsoni, a collembolan from Antarctica. Polar Biol 28, 111–118 (2005). https://doi.org/10.1007/s00300-004-0672-7

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  • DOI: https://doi.org/10.1007/s00300-004-0672-7

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