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Worldbuilding

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    $\begingroup$ A species that requires input from another species in order to complete its reproductive cycle is called a klepton. (From Greek kleptô, I steal.) A well-known klepton species is the edible frog Pelophylax kl. esculentus (formerly known as Rana esculenta). $\endgroup$
    – AlexP
    Commented Dec 18, 2023 at 22:21
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    $\begingroup$ Note that the way you framed your question does not rule out parasites. $\endgroup$
    – DKNguyen
    Commented Dec 18, 2023 at 23:48
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    $\begingroup$ Just to be clear, are you specifically suggesting that copulation and impregnation happens across species? There are plenty of examples of creatures using other species as artificial wombs, or in place of the albumen of an egg. You aren't talking about that, right? $\endgroup$
    – Robert Rapplean
    Commented Dec 19, 2023 at 1:48
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    $\begingroup$ To quote Wikipedia: "A species (pl. species) is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction." If the different species sexually reproduce as you describe, they are one species by common definition. $\endgroup$
    – MisterMiyagi
    Commented Dec 19, 2023 at 9:46
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    $\begingroup$ A number of plants require specific insects or birds to pollinate the seeds. When we wipe out those insects, then the plants can't reproduce. Right now, a number of fruit trees in China are being hand pollinated because of a lack of bees. $\endgroup$
    – David R
    Commented Dec 19, 2023 at 15:28