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In page Diplura:

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Like other non-insect hexapods, diplurans practice external fertilisation. Males lay up to 200 spermatophores a week, which are held off the ground by a short stalk and probably only remain viable for about two days.[1] The female collects the spermatophore with her genital opening, and later lays eggs in a cavity in the ground.[2][3][1] The hatchlings do not undergo metamorphosis, but resemble the adults, apart from their smaller size, lesser number of setae and their lack of reproductive organs.[4]