Rarest of the rarest

You know, colleagues, (sorry, digression from the main topic) I believe that those specimens that we "hunters" come across-they hide very badly and, for example, they would not have been saved from an insectivorous bird.
In the end, even though I caught only one specimen of Cerura vinula crested on an ultraviolet lamp on May 13, this does not mean that it is the only one in the entire forest.

Klossiana from the Polar Urals, I don't remember the name. Winters, I don't remember in what condition (sorry for not accurate data), but at a temperature of -50 in the ground. how many caterpillars will have time to eat leaves in a short season, how many can hatch after such a wintering?!

No need to measure everyone by yourself! Arctic creatures have evolved to adapt to such conditions, they are comfortable there. By the way, about the short summer: one of the adaptation methods is two - year generation.

Is the ground beetle Harpalus dispar (=spiendens) rare???

Yes, you're right about that.. Well, if they haven't adapted much, can it still be difficult for them to develop?..

This is possible in two cases. 1. The species temporarily expanded its range during a period favorable for its climatic conditions (a pseudopopulation was formed). The favorable period has ended - the pseudo-population has disappeared (that's why it is "pseudo"). An example is the expansion of southern species to the north in warm years. 2. Relict populations that have remained in suitable habitats since the time when the climate on the planet was different. An example is northern species (glacial relics) on peat bogs. Indeed, such populations have reduced viability due to the fact that they are "not very adapted", but the species can thrive within the main range, i.e. the species as a whole is not rare.

If an isolated population of this same bessarabica is found, then whether it is a hybrid or not, the fact of the existence of a new species is obvious.

And Mendel's laws???!!! And the splitting of traits in the next generations???!!! This is if the hybrid is capable of reproduction at all, which is not a fact, given that hybridization is inter-generic.
No, the hybrid is far from a species... And if there is an isolated population, it means exactly the species.

- "The rarest of the rarest" - that's us-entomologists!!!

Andreas-I totally agree with you!We're already like mammoths...

That's for sure. Recently, I talked to my supervisor Nikolayev (he teaches at KazGU), and he told me that now even students who want to go to entomology are being forced to go to the specialty of a biotechnologist, like it's fashionable, a big state order plan and all that. In general, now biotechnologists are like lawyers and economists among other biologists. And entomologists are no longer like mammoths, but brush-finned fish - a few pieces remain, and those live at the bottom.