Apterygota

Animal Life has a lot to say about this - maybe not much, but there is. In general, their eggs are sensitive to drying (like themselves), fertilization is external-internal: the male "lays" the spermatophore, the female searches for it when she finds it, takes it for herself and fertilizes. If I'm not mistaken, it sometimes eats, and in some species it is possible that the male "passes" it to the female, for example.

Chromocenter
Thank you very much

There is a book "Determinant of the colembol fauna of the USSR" - there is also a book about reproduction. I can scan it if you want.

As a primitive group, collembolas are characterized by a typical "external-internal" (in the understanding of M. S. Gilyarov, 1970) insemination that occurs without mating, i.e. without the transfer of sperm or spermatophore by the male to the female's genital ducts.
Usually, males deposit sperm droplets on hyaline stalks directly on the substrate. Spermatophores with a protective shell have been described in Slitherbellids. The form of spermatophores and the method of strengthening sperm drops are diverse. Complex spermatophores with several drops on a branched stem are known in Neanurinae (Betsch-Pinot, 1974).
Most collembolas are characterized by disorderly dispersal of spermatophores with active indiscriminate capture of them by females in the presence or absence of males. The probability of such indirect fertilization increases in clusters of legwings. In Symphypleona, various variants of sexual behavior are noted, up to a rather complex one - "courtship", in which fertilization occurs selectively, and the female receives a spermatophore that has just been isolated by the male (Betsch, 1974; Betsch-Pinot, 1977). Direct sperm transfer without substrate is known so far only in Sphaeridia pumilis (Blanquaert and Mertens, 1977): the male deposits a drop of sperm directly on the female's genital opening, after which it is attached to her anogenital segment by a ventral tube.
The male's behavior when laying spermatophores is diverse. Some Symphypleona even have special morphological structures, in particular the "prehensile" antennae of Sminthurididae, which serve to hold the female before laying the spermatophore, sometimes for several days.
Some forms of collembolus are characterized by parthenogenesis, which can be obligate or facultative. It is recorded among representatives of Poduromorpha (some Neanurinae, Tullbergiinae), Isotomidae (Isotoma notabilis, Folsomia Candida), as well as in the slithbelly collembola (genera Arrhopalites, Megalothorax). This phenomenon is probably quite widespread in small soil forms, especially in extreme conditions.
In some Neanurinae, both bisexual and parthenogenetic races are described. The latter are found in places with unfavorable living conditions. Polyploidy is observed in parthenogenetic populations of Neanura muscorum (Cassagnau, 1972a; Deharveng, 1984a).
Development is not necessarily continuous. Growth is interrupted during the cold seasons. Eggs and sexually mature stages may experience dry periods in a state of diapause. In some species, this is due to ecomorphosis.
Collembol eggs are non-kleidoic, sensitive to drying, usually 0.15— 0.30 mm in diameter. Eggs can be diapausing or non-diapausing. Females lay both varieties of eggs in bisexual slitherbell species (Sminthurides aquaticus, Sphaeridia pumi-lis, etc.) and parthenogenetic species (Arrhopalites sericus, Megalothorax minimus; Blanquaert et al., 1981).—only non-diapausing eggs. Arthropods lay unprotected eggs. In slytherins, many species cover them with a layer of liquid excrement that forms a protective shell. It has been experimentally shown that eggs that are not covered with feces quickly dry out (Betsch-Pinot, 1976). The size and shape of eggs change during embryogenesis.
The reproductive cycle is closely related to molts. In some collembola females, the reproductive cycle repeats 10-12 times during their lifetime. A chronological relationship was established between the phases of the reproductive cycle, molting cycle, and feeding cycle (Palevody, 1974). Spontaneous spermatophore laying by all males was described in Sinella coeca 24-36 hours after molting. It is suggested (Waldorf, 1975) that the mass response of spermatophores coincides with the presence of the female sex pheromone.
Molt collemboles throughout life. The number of molts can be very large, in some species — more than 50. The growth curve during moults is S - shaped (Joosse and Veltkamp, 1970).

This is a picture from the same book

Pictures:

Collembola.jpg — (107.79к)