Water beetles

I decided to add a photo of my friend and colleague

Cybister (Scaphinectes) lateralimarginalis (De Geer, 1774)

Saratov, Lysogorsky massif, St. Alexeyevsky Convent district, pond, 10.04.2001 (female) leg. & det. N. V. Rodnev, scans by N. V. Rodnev

original scans are available on the ZIN website: http://www.zin.ru/Animalia/Coleoptera/rus/cyblatnr.htm

This post was edited by Alexey Sazhnev-08.02.2010 17: 10

Pictures:

Cyb_lat_down.jpg — (26.21к)


Cyb_lat_prof.jpg — (24.03к)


Cyb_lat_up.jpg — (28.47к)

Acilius sulcatus A female and a male
are both caught with a net in a pond.
Moscow region, Volokolamsk district, July 2007





This post was edited by Sugercete - 02/11/2010 00: 25

Please enlighten a non-specialist on the following issues:
1. In the 20-30s of the last century, the Entomological Review published an article by Alsufyev (the one who studied dung beetles in the Caucasus) with a description of a new beetle species found on muskrat in the Penza region (I have the article itself, but you need to look in the paper archive) and in its burrows. But, it seems that this species was described somewhat earlier in Europe (I think a similar species was described from a beaver in France)!? What is this species? Can it live on muskrat or beaver??

2. In the Volga region and Upper Volga, who is more common-latissimus, lapponicum or lateralimarginalis ??? Do they have similar biotopes?? Thanks!

Please enlighten a non-specialist on the following issues:
1. In the 20-30s of the last century, the Entomological Review published an article by Alsufyev (the one who studied dung beetles in the Caucasus) with a description of a new beetle species found on muskrat in the Penza region (I have the article itself, but you need to look in the paper archive) and in its burrows. But, it seems that this species was described somewhat earlier in Europe (I think a similar species was described from a beaver in France)!? What is this species? Can it live on muskrat or beaver??

2. In the Volga region and Upper Volga, who is more common-latissimus, lapponicum or lateralimarginalis ??? Do they have similar biotopes?? Thanks!

1) Silphopsyllus desmanae lives on muskrat. He doesn't live on beaver or muskrat. Another beetle, the beaver flea (Platypsyllus castoris), lives in the beaver's fur. I found it in the Yaroslavl region.
2) Dytiscus latissimus is rare everywhere, preferring large bodies of water. About his biology is well written here http://www.zin.ru/ANIMALIA/Coleoptera/rus/dytlatsg.htm Dytiscus lapponicus in Russia is distributed from the western borders to the Yenisei. Also not frequent, local, although in some places in some reservoirs the number may be significant. As for Cybister lateralimarginalis, in Russia it is widespread in the south of the European part, and it is not present on the Upper Volga.

Lapponicus inhabits mainly reservoirs with acidic peat water-quarries, lakes in swamps... It used to live right on the territory of Yaroslavl, but now it is burned out by a rotan... In some reservoirs, the population is not just high, but very high...

It seems to me that in the Volga region, from north to south, lapponicus becomes less frequent, and lateralimarginalis, on the contrary, is more common. In the Samara region (Middle Volga region), lateralimarginalis is the most common species, while lapponicus is only rarely found.

Please enlighten a non-specialist on the following issues:
1. In the 20-30s of the last century, the Entomological Review published an article by Alsufyev (the one who studied dung beetles in the Caucasus) with a description of a new beetle species found on muskrat in the Penza region (I have the article itself, but you need to look in the paper archive) and in its burrows. But, it seems that this species was described somewhat earlier in Europe (I think a similar species was described from a beaver in France)!? What is this species? Can it live on muskrat or beaver??

2. In the Volga region and Upper Volga, who is more common-latissimus, lapponicum or lateralimarginalis ??? Do they have similar biotopes?? Thanks!

If you are interested, the larva of Silphopsyllus desmanae was described a little later than the beetle itself by Semenov-Tyan-Shansky and Dobrzhansky based on materials from the Lipetsk district of the Tambov province in 1927.

There is an article with a description here: www.zin.ru/ANIMALIA/Coleoptera/pdf/Semenov27.pdf

To Sazhnev:
Just got me the deputy director of the university.the library brought the desired issue of "VESTNIK PSPU" (2005). Ivanovsky's article "Fauna of water beetles of the Penza region" is copied and sent to your email address.

I didn't understand, do you have an article by Alsufiev on S. desmanae? As I understand it, you also want to post literature for your project on water resources in the Volga region?

This post was edited by Penzyak - 12.02.2010 10: 59

I didn't understand, do you have an article by Alsufiev on S. desmanae? As I understand it, you also want to post literature for your project on water resources in the Volga region?

Silphopsyllus desmaniae is not correctly classified as an aquatic beetle. It is, after all, an ectoparasite of muskrat, and systematically belongs to Staphylinoidea.

To Sazhnev:
Just got me the deputy director of the university.the library brought the desired issue of "VESTNIK PSPU" (2005). Ivanovsky's article "Fauna of water beetles of the Penza region" is copied and sent to your email address.

I didn't understand, do you have an article by Alsufiev on S. desmanae? As I understand it, you also want to post literature for your project on water resources in the Volga region?

Oleg, thank you so much for the photocopies, we are very much looking forward to it!

We will not publish any literature on aquatic animals, although Oleg Brekhov has a good collection of articles on aquatic coleoptera on his website. Our task is: 1. to compile a list of Saratov gidradefags, taking into account possible ones (which is exactly what lists from neighboring regions are needed for), 2. plus, we make a pictorial determinant of this group for the Volga region (while at the stage of tables), which we post in the form of a tested version on my website... in the future, there is a desire to publish all this on paper, with ecology and distribution of species in the Volga region (this will no longer be available on the Internet).

Graptodytes granularis Linnaeus, 1767
Samara region, Kinelsky district, near the village of Mal. Malyshevki; floodplain lake with dense floating and submerged vegetation; 18.08.2005. Length - 2.3 mm.

The original image is larger, but for some reason it doesn't want to be inserted.

Hygrotus (s.str.) versicolor Schaller, 1783
Samara region, Alekseyevka settlement, Samara River floodplain lake, 01.06.2010.

Ochthebius (s.str.) sp.
Samara region, near the settlement of Alekseyevka, temporary reservoir in the floodplain of the Samara River, 17.05.2010. Length-1,9 mm
.

And a water lover who came across me in the Yaroslavl region only once and quite unexpectedly:
Hydrochara dichroma (Fairmaire, 1892)
Yaroslavl region, Rostov, Lake Nero, 03.05.1996.

I suppose it can't. In H. caraboides, the terminal segments of the maxillary palps are unicolored, dark, and relatively longer (width - to-length ratio 1:5) And in H. dichroma, these tentacle segments are yellow or light brown with a darkened apex and somewhat shorter (width to length 1:4) At my beetle-just such. In addition, according to the illustration to the determinant by A. G. Kireichuk and A. G. Shatrovsky, the shape of the spike on the keel of the prothorax is also different: in H. caraboides it is more "triangular", the base is wider, and in H. dichroma it is narrower, "spike-like" (like in my specimen). I'm 99% sure of my definition. But I would like to wait for A. G. Shatrovsky's answer. Not yet. We are waiting for you, sir

If still relevant. I believe that this is still an under-colored caraboides. Among the dozens of specimens of this species examined, there were several with similar leg coloration, and a large number of beetles have light palps. Only the shape of the last segment of the tentacle is reliable among all the characteristics listed in the Guide to Freshwater Invertebrates of Russia (2001). The color of the appendages is an unreliable sign. The shape of the prothorax keel and the thorn on it is also very variable. The drawings in the book offer only one of the options.

Measuring the feelers gave different results from the book data. Width / length ratio of the last segment in six specimens of caraboides: 1:4,6; 1:3,8; 1:4,3; 1:4,2; 1:4,2; 1:4,8. The only instance of dichroma available to me from the South Kazakhstan region is: 1:3,6.

The proportions of the last segments of the tentacles in the photo given by Viktor, unfortunately, are poorly visible. However, in my opinion, they do not reach dichroma. You can study the genitals. Judging by the shape of the claws in the photo - a male. I also advise you to contact Alexander Prokin http://www.zin.ru/animalia/Coleoptera/rus/prokin.htm

Below are photos of prothorax palps and keels.

Thanks! In the near future, I will try to take a better picture of the tentacles and post them.

As promised, I post a photo of the tentacles and keel of the prothorax of my specimen, suspected of belonging to Hydrochara dichroma (according to my feelings, I can admit - to put it mildly, I was overreacting - caraboides is ). For comparison, I also present photos of the same details of the structure of beetles from my collection, reliably identified as H. caraboides. I apologize for the lousy quality, but I hope the main thing is visible. If not, I am ready to update something if possible.

Hydrochara ?dichroma



Hydrochara caraboides



Stanislav, I am waiting for your verdict!

This post was edited by Dmitrich - 10.10.2010 17: 43

All the necessary signs are clearly visible in the photo. Of course, these are caraboides.
Interestingly, I don't have any beetles that are so light from below, and this is not the first one from the MO in the photo.

All the necessary signs are clearly visible in the photo. Of course, these are caraboides.
Interestingly, I don't have any beetles that are so light from below, and this is not the first one from the MO in the photo.

Thanks! Now I will make appropriate changes to the original post, which misled my colleagues (once again, my apologies ). A small clarification: the beetle is not from the Moscow Region, but from the Yaroslavl region (the shore of Lake Nero, Rostov).

Scanography.
From left to right:
Cybister tripunctatus (Fabricius, 1798) - female (Turkmenistan)
Cybister lateralimarginalis (DeGeer, 1774) - female (Samara region)
Cybister chinensis Motschulsky, 1854-female (North Korea)


This post was edited by botanque - 12.10.2010 15: 02

I don't know if this can be called an "arms race" like the Acilius and Ditiskus. And if I'm not mistaken, the Cybisters are older than they are. Also, females of tripunctatus and lewisianus (http://www.zin.ru/animalia/Coleoptera/rus/dyt_1405.htm) smooth at all. Similar structures in the form of a roughly incised mesh on the pronotum and elytra are sometimes found in females of Hydaticus. Or fine fine grooves in some Rhantus. And in Colymbetes, both sexes are rough.

This post was edited by botanque - 12.10.2010 17: 32

And if I'm not mistaken, the Cybisters are older than they are.

But after all, the mechanism (grooves and grooves with hairs) of fighting the male's suckers can appear in them independently?

Interesting article.

I was digging through my disks and found this picture interesting. Although the phenomenon is common.
"Missed" or male Dytiscus marginalis Linnaeus, 1758 far from water bodies, in a puddle, on a forest road.
Taken: 29.07.2005 Here: M. O. Lyuberetsky district of okr. der. Torbeevo.

Pictures:

Dytiscus_marginalis.JPG — (160.35к)

Such a one-sided melanist.
Graphoderus zonatus (Hoppe, 1795); Yakutia, Vilyu River, August 1982, A.V. Vinogradov leg.

Graphoderus bilineatus (DeGeer, 1774)
Samara region I. N. Goreslavets leg., 19.05.1996
Scanography.

Hygrotus (Coelambus) marklini (Gyllenhal, 1813)
Bogdo-Baskunchak district, Astrakhan region. Pion. beam, light DRL. 6-7. 06. 2005 A. tilly leg.

Hygrotus (Coelambus) chinensis (Sharp, 1882), female.
Primorsky Krai, Ussuriysky district, near the village of Krounovka. 08-11. 07. 2002. A. Tilly leg.

Bagous limosus (Gyllenhal, 1827)
Samara region, surrounding settlement Alekseyevka, floodplain of the Samara river, 01.06.2010. p.Litovkin leg. In a large temporary pond, a crow trap among the pondweed.

Probably accidentally inserted the wrong photo...

All right. Elephants of the genus Bagous are phytophilic aquatic beetles. Larvae develop in the tissues of aquatic and near-water plants, in this case, Beetles spend a significant part of their time under water on rhizomes (Potamogeton spp.)

Does he have any relatives in Primorye?

Yes, of course. And not only them. See for example DV determinant vol 3 part 3 and here http://www.zin.ru/Animalia/Coleoptera/rus/hydrkeyf.htm

I didn't find any topics on near-water beetles, so I decided to put them here.
Bledius furcatus (Olivier, 1811), A. Kovalev det.
Orenburg region, Yasny, 20.05.2005. A. Shapovalov leg.


This post was edited by botanque - 10/14/2011 10: 54

As it turned out, there are problems with distinguishing these three types of Rhantus. Females can be distinguished by the microsculpture of the elytra:

Hydraena (s.str.) pulchella Germar, 1824
Orenburg region, Buzuluksky bor, ruchey, 13.06.2010, Litovkin village leg. Length-1.6 MM

Peltodytes caesus (Duftschmid, 1805)
Samara region, surrounding area of the village. Alekseyevka, Samara River floodplain, lake, 17.05.2010, Litovkin village leg.

A little exotic
Hydaticus (Guignotites) satoi Wewalka, 1975; male.
Thailand: Near Mae Na Chon vill., Mae Chaem, Chiang Mai, N 18°45'08" E 98°20'08", h = 820 m, 16-18.08.2009, D.V. Potanin leg.


This post was edited by botanque - 10/11/2011 15: 54

Thailand: Near Mae Na Chon vill., Mae Chaem, Chiang Mai, h = 820 m, 16-18.08.2009, D.V. Potanin leg.

Op... Did I forget to give you my GPS coordinates???