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Quarterly Journal of Microscopical Science, Vol s2-83, 153-169, Copyright © 1942 by Company of Biologists

The ‘Dorsal Organ’ of Collembolan Embryos

O. W. TIEGS 1

1 Department of Zoology, University of Melbourne

1. The cells of the ‘dorsal organ’ of collembolan embryos give origin to long filamentous outgrowths, which extend under the functional egg-shell (blastodermic cuticle) well on to the lower half of the egg.

2. In its general structure the organ shows a close resemblance to the dorsal organ of Symphyla; but there is no good evidence for any affinity between it and the ‘dorsal organs’ or ‘dorsolateral organs’ that have been described from the embryos of Crustacea, Arachnida, Chilopoda, or pterygote Insecta.

3. While its function is unknown, its structural relations are at least consistent with the view that it may be an organ for the transference of water from without to the embryonic tissues.






© The Company of Biologists Ltd 1942