Evolution of insects

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Коллекционер, 16.12.2018 2:23

Such an extensive and interesting topic for some reason is still not much touched on in this forum.

I'll start with a recent question that interested me: How did insects solve the problem of egg drying when they came out on land? The first insects laid them in the substrate, judging by the presence of an ovipositor in the fossils. But the eggs of modern insects can also develop outside the substrate, and it is obvious that this transition occurred at the dawn of the formation of the order.
How was the problem of drying out eggs solved? Which, apparently, was solved very quickly in geological terms.
It took the reptiles a very long time to solve this problem.

This post was edited by Collector - 12/16/2018 02: 25

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16.12.2018 11:21, Larinus

Such an extensive and interesting topic for some reason is still not much touched on in this forum.

I'll start with a recent question that interested me: How did insects solve the problem of egg drying when they came out on land? The first insects laid them in the substrate, judging by the presence of an ovipositor in the fossils. But the eggs of modern insects can also develop outside the substrate, and it is obvious that this transition occurred at the dawn of the formation of the order.
How was the problem of drying out eggs solved? Which, apparently, was solved very quickly in geological terms.
It took the reptiles a very long time to solve this problem.

Probably, there were several ways, for example: compaction of the egg shell, protective coating of it (or the entire clutch), laying the egg in water or a more or less moist environment, including plant tissues. By the way, not only the egg needs protection from drying out, but also larvae and pupae. The transition to development within plant tissues solved several problems at once.

16.12.2018 12:03, Dracus

Gilyarov, as we know, believed that the soil served as a convenient transition environment for insects when they came to land (he even attributed the occurrence of complete metamorphosis to this). And, indeed, the entognathus does not have an ovipositor (although it may well have been lost a second time), but they live under rocks and in other wet places and lay eggs in the same place, openly. You should read it, for sure he compared the structure of the chorion in different groups.
But it's an interesting question anyway, and I'm surprised it's not being given the proper attention - my cursory search in Scholar didn't turn up any relatively new articles on chorion evolution specifically in connection with landfall.

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