Panagaeini tribe. Caraboidea, Carabidae, Panagaeini

Community and Forum → Insects images → Panagaeini tribe. Caraboidea, Carabidae, Panagaeini

vasiliy-feoktistov, 14.10.2009 12:19

I start the topic with a photo of this ground beetle:
Panagaeus bipustulatus Fabricius, 1775
Beetle caught on 24.04.2000 Here: M. O. Balashikha district, okr. der. Poltevo, in the afternoon on the field road.
Many thanks to Evgeny Komarov for his help in identifying the problem.

This post was edited by vasiliy-feoktistov - 14.10.2009 16: 31

Pictures:
picture: Panageus_bipustulatus.jpg
Panageus_bipustulatus.jpg — (87.74к)

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16.10.2009 3:48, Egorus

After writing the previous post, I found in the topic "Definition of beetles"
information about the differences between R. bipustulatus and R. cruxmajor.

Here are some thoughts.

1. I would like to ask vasiliy-feoktistov not to delete the photo from the topic, transferring
it to another, but simply duplicate it. This is probably the best way. You don't need
to force people to navigate through topics, piecing together the whole thing.

2. Regarding the size of the pronotum bipustulatus and cruxmajor
-We all know that if the plane of the lens is not parallel to the plane
of the subject (in this case, the pronotum), then
one of the dimensions (or even two) is distorted. Therefore, the actual size can only be guessed.

3. However, at different image scales, the ratio of dimensions
(in this case, width to length) will be the same.

4. By measuring (directly on the screen) the width and length of the pronotum, and then dividing
one by the other, I got the following data::

- photo taken by vasiliy-feoktistov______________ B/L = 1.25 (bipustulatus)

- rpanin snapshot______________________ V/L = 1.23 (cruxmajor)

- snapshot of Egorus _____________________ V/L = 1.28 (sp.)

- EVK image from Opr. Zhukov___ _ _ _ In/L = 1.25 (cruxmajor)

5. I understand that you can measure in different ways, with a tolerance up or
down, and you need to take not whole mm., but with tenths, and the results
will be different, but the conclusion is the same - all specimens have a pronotum width
greater than the length.
But how much is clear.

6. Are there any other keys to the definition of bipustulatus and cruxmajor

7. Nothing personal, only in the name of finding the truth.

This post was edited by Egorus-16.10.2009 08: 36

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17.10.2009 7:24, vasiliy-feoktistov

To Egus:
"1. I would like to ask vasiliy-feoktistov not to delete the photo from the topic, transferring
it to another, but simply duplicate it. This is probably the best way. You don't need
to force people to navigate through topics, piecing together the whole thing."
I only remove photos of beetles from the subject if the beetle is accurately identified. In order not to clutter the already overloaded branch, I always indicate the link where this image can be seen.
" - snapshot of Egorus _____________________ B/L = 1.28 (sp.)" In your case, this is P. bipustulatus (in the previous photos, there are both views)- compare it.
"6. Are there any other keys to the definition of bipustulatus and cruxmajor"
I do not know any keys to distinguish between these two types. Therefore, I placed it in the "definition"-they told me there and I, having the copy myself on hand,determined it.

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21.10.2009 11:48, evk

Well, let's try it this way, otherwise there were enough halves here - even I probably won't understand these "monsters".
A. Pronotum.
1. P. bipustulatus, 2. P. crux-major
Clearly shows on the first almost correctly rounded lateral edge, while on the second in the middle it is clearly expanded even somewhat obtusely.
picture: bipustulatus_cruxmajor.jpg

B. Elytra.
1. P. bipustulatus, 2. P. crux-major
Here is what Fornax13 wrote about and I talked about in many posts above. I.e. the apical dark spot and the median dark band in bipustulatus almost always clearly go to the lateral edge of the elytra and at the same time the dark color goes from them to the side. at the edge, isolating the posterior red spot from it (the name comes from here - that is, we have spots). In crux-major, the lateral edge of the elytra at the posterior spot is light, the dark spots on it do not continue anteriorly and posteriorly, as a result, the posterior light spot closes with the lateral edge, i.e. we have a dark cross-crux-major again

This post was edited by evk - 21.10.2009 11: 52

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21.10.2009 14:14, evk

Probably, it is worth looking at the rest of the representatives of the tribe that live on the territory of the former USSR, especially since there are only 7 species on the checklist.
Total left to show 5.

1. Panagaeus relictus Semenov et Bogachov 1938.
Turkmenistan, Kelif settlement district, 4.06.1981.
picture: Panagaeus_relictus.jpg

2. Panagaeus japonicus Chaudoir 1861.
South of Primorsky Krai, Khasansky district, Riazanovka village, 9.08.1982.
picture: Panagaeus_japonicus.jpg

3. Panagaeus robustus A.Morawitz 1862.
Kuril Islands, Kunashir Island, Tretyakov Village, 15.08.1988.
picture: Panagaeus_robustus.jpg

4. Tinoderus singularis (H.Bates 1873).
South of Primorskiy kr., Ussuriysk district, Kamenushka, on UV-light, 8.07.1979.
picture: Tinoderus_angularis.jpg

5. Peronomeris auripilis H. Bates 1883.
South of Primorsky Krai, 42 km West of Vladivostok, Barabash settlement, on the light of the DRL, 31.07.1990.
picture: Peronomerus_auripillus.jpg