Genus Chlaenius

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Archypus, 05.03.2007 0:36

I represent two species of ground beetles of the extensive genus Chlaenius from the Moscow region: the West Palaearctic Ch. (Chlaeniellus)tibialis Dejean and the European-Siberian Ch. (Pelasmus)costulatus Motschulsky. Beetles of this genus are mostly hygrophilic. 5 species are registered in the region: Ch. (Chlaeniellus)vestitus, Ch.(Ch.)nigricornis, Ch. (Ch.)tibialis, Ch. (Ch.)tristis, Ch.(Pelasmus)costulatus. Two more species, Ch. (Agostenus) sulcicollis and Ch. (A.)quadrisulcatus, are distributed in the forest zone of Eurasia and may be found in the region.
Ch. tibialis was previously mistaken for the absent Ch. nitidulus species, from which the two-tone color of the legs differs well externally. It lives on the banks of rivers on clay soil, occurs infrequently, sporadically. This copy. it was caught on the bank of a dammed stream (open station) in the Istra district.
picture: Ch_tibialis.jpg

Ch. costulatus lives in swamps in the forest and forest-steppe zones of Europe and the West. Siberia. There are isolated finds of this species in the region. It was caught in a soil trap in a swampy meadow in Orekhovo-Zuyevsky district 7 VI-1998.
picture: Ch_costulatus.jpg

Comments

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06.03.2007 16:03, Archypus

Costulatus, by the way, is not at all isolated. At Nikitsky's I saw rows of this type. But I didn't come across one

Yes, probably. But here we should rather talk not about the number of instances, but about the number of localities in a particular region. I think that the Nikitsky series is from the same point. Within two weeks, I got 4 copies, and Nikitsky set traps there for several years. In the list of Fedorenko, this species was registered near Moscow, it seems, 1 time in some shaggy years. In a suitable biotope, the species can be completely ordinary. An example of this is the same Carabus maacki in the floodplain, where cows graze, or C. menetriesi in the same meadow, which poured dozens into cups. But according to Orlov, who studied the species composition of Carabus in the region, it is one of the rarest representatives of the genus.

This post was edited by Archypus-09.03.2007 10: 28

06.03.2007 17:54, Dinusik

The Chlaenius fauna of the Amur region is represented by 7 species:
1. Chlaenius (Lissauchenius) posticalis A. Morawitz, 1854
2. Chlaenius (Chlaenius) pallipes Gebler, 1823
3. Chlaenius (Chlaeniellus) tristis Schaller, 1783
4. Chlaenius (Agostenus) alutaceus Gebler, 1829
5. Chlaenius (Agostenus) quadrisulcatus Paykull, 1790
6. Chlaenius (Chlaeniellus) circumductus A. Morawitz, 1862
7. Chlaenius (Naelichus) stschukini Menetries, 1837

Chlaenius (Chlaeniellus) circumductus A. Morawitz, 1862
Distribution: Northeastern China, Korean Peninsula. Russia: Amur Region, Khabarovsk Krai, Primorsky Krai.
It is found on the swampy banks of water bodies, on wet meadows. Common.
Chlaenius (Naelichus) stschukini Menetries, 1837
Distribution: Northern Mongolia, Northeastern China, Korean Peninsula, Japan. Russia: Eastern Siberia, Amur Region, Khabarovsk Krai, Primorsky Krai.
It is found along the banks of rivers, in wet meadows in the grass. Common.

Pictures:
picture: Chlaenius_stschukini.JPG

Chlaenius_stschukini.JPG — (80.12к)

picture: Chlaenius_circumductus.JPG

Chlaenius_circumductus.JPG — (69.28к)

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11.03.2007 23:19, Archypus

Well, here we are!

In the "Green" I did not find anything at all tibialis-a. But it begged the question. For an answer, it would be good to have high-quality photos of both types for clarity. My technique, unfortunately, does not yet allow me to take pictures at a high level

, but I'll try to say what I know. And if something seems wrong, please correct me.
Species of the group-nitidulus (conditionally), which also includes-tibialis, - kindermanni, - chrysothorax are very similar to each other and externally differ in nuances of structure and color. The group is complex in its taxonomy; it is no coincidence that the status of the taxa-kindermanni and-chrysothorax has been constantly updated. The correspondence of northern-nitidulus to the species-tibialis was shown by Makarov (Checklist, 1995).In addition to the color of the legs, -tibialis has more pigmented 2 and 3 segments of the antennae, slightly lighter in color than the otal segments, and a more incised edge of the pronotum base (the pronotum has a more heart-shaped shape).

Pronotum of Chlaenius
nitidulus on the left: Ukraine. Transcarpathian region. Nevitskoe
on the right: Kyrgyzstan. Osh region. Palai'i
picture: IMG_0524MW.jpg

As you can see, the pronotum is noticeably different in shape. But to what extent do these differences extend beyond the variability of the species? We need statistics, we need material.

Chlaenius (Claeniellus) nitidulus (Schrank, 1781)
the labels are the same. West Palaearctic view. For Kyrgyzstan, it does not seem to have been given earlier
picture: Ch_nitidulus264.jpg

This post was edited by Archypus - 14.04.2007 18: 07

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20.03.2007 1:22, Archypus

Other members of the subgenus Chlaeniellus are the West Palaearctic Chlaenius (Claeniellus) vestitus(Paykull, 1767), which is more common in the Carpathian Mountains, in the Caucasus, where it lives along river banks on sandy-pebble alluvium. It is also found on Kopet Dagh. It doesn't occur very often in the Moscow Region. Two specimens were caught in Moscow in the beginning. 80 - ies of the last century in the floodplain of the Chertanovka River near the Lower Tsaritsyn ponds on silted loam in early May and late July
picture: Ch_vestitusV.jpg

and, living mainly on saline soils in steppe and semi-desert zones
Chlaenius (Claeniellus) terminatus Dejean, 1826. It is more common on the coast of the Caspian Sea in the Astrakhan region. Assembled in August 1/2, 1985 in the village. Kraynovka at the mouth of the Terek River to the light.
picture: Ch_terminatus.jpg

This post was edited by Archypus - 03/20/2007 09: 41

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23.03.2007 2:49, Archypus

Probably a few more words should be said about Ch. terminatus. The species is considered rare, characteristic only of the Eurasian steppe subdistrict. In this regard, it would be good to map the points of his finds. I've only seen instances from the Caspian Sea. Brigadirenko gives it for the salt marshes of the Dnipropetrovsk region; based on these data, Ch. terminatus is included in the Red Book of Ukraine. Jacobson indicated it for the Crimea, but in the latest lists of ground beetles of the peninsula, the species is marked with a large question mark. Given for the Srebarna Nature Reserve on the Danube in Bulgaria. I didn't find any more data on this type.
Well, and a very informative article In Brigadirenko: comsci.dsu.dp.ua/zoo/Brigadirenko_V_V/Brigadirenko_V_V/2001_1.pdf

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