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Updated: June 17, 2025
It deserves especial notice that the males do not acquire their bright colours until they become mature. They appear to be much more numerous than the females; they differ also in the larger size of their chelae. In some species of the genus, probably in all, the sexes pair and inhabit the same burrow. They are also, as we have seen, highly intelligent animals.
There you see a perfect body." He pointed toward the rykor. "It has no brain. Here," and he raised one of his chelae to his head, "is the perfect brain. It needs no body to function perfectly and properly as a brain. You would pit your feeble intellect against mine! Even now you are planning to slay me. If you are thwarted in that you expect to slay yourself.
Fritz Muller suggests that these differences between the two male forms of the same species may have originated in certain individuals having varied in the number of the smelling-threads, whilst other individuals varied in the shape and size of their chelae; so that of the former, those which were best able to find the female, and of the latter, those which were best able to hold her, have left the greatest number of progeny to inherit their respective advantages.
In many species the chelae are of unequal size on the opposite side of the body, the right-hand one being, as I am informed by Mr. Bate, generally, though not invariably, the largest. This inequality is also often much greater in the male than in the female.
Mill, J.S., on the origin of the moral sense; on the "greatest happiness principle;" on the difference of the mental powers in the sexes of man. Millipedes. Milne-Edwards, H., on the use of enlarged chelae of the male Gelasimus. Milvago leucurus, sexes and young of. Mimicry. Mimus polyglottus. Mind, difference of, in man and the highest animals; similarity of the, in different races.
The best smellers would overcome all that were inferior to them in this respect, unless the latter had other advantages, such as more powerful chelae, to oppose to them. The best claspers would overcome all less strongly armed champions, unless these opposed to them some other advantage, such as sharper senses.
It was a pair of large chelae and immediately thereafter there crawled forth a hideous kaldane of enormous proportions. He was half again as large as any that Tara of Helium had yet seen and his whole aspect infinitely more terrible. The skin of the others was a bluish gray this one was of a little bluer tinge and the eyes were ringed with bands of white and scarlet, as was its mouth.
Bartlett, on courting of Argus pheasant. Bartram, on the courtship of the male alligator. Basque language, highly artificial. Bate, C.S., on the superior activity of male crustacea; on the proportions of the sexes in crabs; on the chelae of crustacea; on the relative size of the sexes in crustacea; on the colours of crustacea.
That the two forms of the chelae of the males occur in this species is so far worthy of notice, because the formation of the chelae, which differs widely from the ordinary structure in the other species, indicates that it has quite recently undergone considerable changes, and therefore such a phenomenon was to be expected in it rather than in other species.
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