Abstract
THE male individuals of Apus cancriformis are so rare, that it appears worth while recording the occurrence of one amongst the specimens used in the Zoological Laboratory in Oxford, during the ordinary course of our work. As Kozubowski showed in 1857, the only external sexual difference is the absence in the male of the egg-sac on the sixteenth appendage, known as the oostegopod of the female. This limb in the male is quite similar to its neighbours: there are no appendages modified for holding the female, such as occur in the allied form, Branchipus. It is generally stated that the male of A. cancriformis is about one-third the size of the female; whilst Lubbock found that the male of Lepidurus productus is larger than the female. The present male did not differ in size from the females; some of which were slightly larger, others smaller.
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BENHAM, W. Male of Apus. Nature 53, 175 (1895). https://doi.org/10.1038/053175c0
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DOI: https://doi.org/10.1038/053175c0
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