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It is an adaptation to the terrestrial life-mode - evolved as apomorphy in the stem species of the Arachnida -- that males produce a spermatophore, which indirectly transfers their sperm to the females. In some arachnid groups, mating behaviours evolved to secure that the female finally to “finds“ this spermatophore: males hold the females somehow and stimulate her to perform a “dance“, during which the female gets guided to the spermatophore, which sticks on the ground. There are even arachnid groups in wh