I really wonder what this is:
I find it near pound in Czech Republic (Central Europe). It's 2 inches long, AP. half wide. It was quite fast.
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2 Answers
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It is a Coleopteran insect (Beetle order) in the Ground beetle (Carabidae) family. Based on the elytra (protective wings) and the dark first antennal segment, it looks like Carabus granulatus. C. cancellatus is very similar, but has reddish first antennal segments. I don't think there are any other similar species in the Czech republic, but don't know the fauna there well. Overall, Carabus has many species and several are native to Eurasia and can be a size of 2 inches.
https://en.wikipedia.org/wiki/Beetle#Wings
https://en.wikipedia.org/wiki/Carabus
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$\begingroup$ I agree, based on the european species I know of, it should be Carabus granulatus, C. clathratus or C. cancellatus. I suspect all of them are found in the Czech republic. $\endgroup$ Commented Apr 16, 2018 at 20:21
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$\begingroup$ Scratch C. clathratus, which has pits between the elytra lines (instead of raised bumps). In my literature, the other two are separated by the color of the first antennal segment, which cannot be seen clearly in the picture. $\endgroup$ Commented Apr 16, 2018 at 21:40
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$\begingroup$ I am so sorry. I wanted to do better picture, but it run away as soon as it noticed me. But I have a picture, where it can be seen (I think so). Anyway I didn't put it there in first place because don't have clue how to identify a bug in science way. $\endgroup$– L.DiagoCommented Apr 16, 2018 at 23:23
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1$\begingroup$ @user40760 The dark first antennal segment in your second picture says that it is Carabus granulatus. On C. cancellatus it is reddish in colour. $\endgroup$ Commented Apr 17, 2018 at 7:49
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Sorry for the late answer. I only bumped into this photo today. And sorry, guys. It is neither granulatus or cancellatus. This is a Carabus ullrichi. Without a single doubt. granulatus is narrow and elongated. Primary and secondary keels with cancellatus are more narrow. This one is convex, plump with very distinct keels. Carabus ullrichi. For sure.
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1$\begingroup$ Can you add sources to your answer, and an image showing that it is indeed this speccies? $\endgroup$– AliceD ♦Commented Feb 10, 2021 at 21:23