Identification of Hymenoptera (wasps, bees, ants)

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11.07.2016 13:01, AVA

something I can't determine before the appearance of this ectemnius.
about 12 mm. The 3rd part of the sawyere is slightly longer than its width, less than the 2nd part. The top of the platypus is in the form of a platform, slightly concave in the middle, without side teeth. Unfortunately, you can't see the inside of the mandibles. Midrib in very thick, rather rough dotted line, without longitudinal and transverse wrinkles. The transverse keel on the mid-chest is weak, only from the sides. The sides of the mid-chest are shiny with sparse but clear dots. tergites are quite dense, but finely dotted. 1st tergite in a rarer dotted line, shiny.
I would have assumed that nigritarsus, but according to the photo in the Internet, the color of the abdomen is completely different.

Ectemnius nigritarsus
Body color varies. Main thing - sculpture mesopleur.

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11.07.2016 16:55, Rhabdophis

Alexander, did you find out by imago?
According to the larva from the Lorenz/Kraus keys, it is N. caeruleocarpus that is obtained.
The only discrepancy (this is already in the text description) is the absence of longitudinal dorsal-lateral stripes. But the photo, as far as I understand, shows the last stage of the larva (prepupa) when many of the signs characteristic of the previous stages are lost.

Yes, by imago. True, as far as I know, the bourgeoisie of many nematuses was divided into groups of similar species. So maybe it's not N. caeruleocarpus, but in this case it's something close to it. In general, I have not been tracking work on nematins for a long time. The group is the most difficult among sawflies and there is no way to fully engage in them.

I can't say anything about the stripes of this species. It's no secret that larvae at different ages can look very different, which they periodically forget to indicate in the determinants. This may also be due to geographical or individual variability, but there is simply no such data.

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11.07.2016 18:04, insectamo

Yes, by imago. True, as far as I know, the bourgeoisie of many nematuses was divided into groups of similar species. So maybe it's not N. caeruleocarpus, but in this case it's something close to it. In general, I have not been tracking work on nematins for a long time. The group is the most difficult among sawflies and there is no way to fully engage in them.

I can't say anything about the stripes of this species. It's no secret that larvae at different ages can look very different, which they periodically forget to indicate in the determinants. This may also be due to geographical or individual variability, but there is simply no such data.

Yes, I understand that there is a constant shuffling among nematodes and related genera, the literature is becoming outdated and the same Lorenz / Kraus does not correspond to the modern classification. But this does not prevent (in any case, it did not prevent this time) to bring the larva to the species in whatever genus it is now. Most of the genera and species immediately fell off based on the characteristics that are visible in the photo: cerci, the number of transverse folds, the location of spots and bristles. With the same features that are indicated in the keys, but are not visible in the photo - there was a hitch (for example, differences with some species of Amauronematus), but they also disappeared after reading their description. In addition, the species N. caeruleocarpus itself stands apart from other nematodes in the keys for determining genera.
So, according to the Lorenz/Kraus keys, I don't see any other option other than N. caeruleocarpus.
Another thing is that the book is also outdated in terms of the number of species, and it may not be N. caeruleocarpus, because this species is simply not in the book.
But there's nothing you can do about it.
But I am glad that parallel definitions of larva and imago led to the same result ))

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12.07.2016 7:23, Rhabdophis

And here's another thing: if there is a similar species, then, apparently, the copy of Gennadich should be signed, putting a question mark in front of the genus - ?Nematus caeruleocarpus, because not only the specific name, but also the generic name may be different.
So?

I don't think if it's not Nematus caeruleocarpus, then it's someone close to the same genus. It wasn't assigned to another class, at least not if you checked the bourgeois databases (although these databases haven't been updated since 2013).

If we focus on the old literature, there is no one left but N. caeruleocarpus. But in Europe, there are several other similar species with an unclear status. How similar they are and how they differ I do not know, because I left attempts to deal with them as soon as I started. They were mostly used as synonyms of N. caeruleocarpus, but in some cases as independent names. A colleague of mine from the Institute of Electrotechnical Research of the Siberian Branch of the Russian Academy of Sciences said that there is some relatively recent work on nematodes growing on willows. It is just devoted to the analysis of twin species and, according to him, they were mercilessly crushed there. Of course, I didn't see this article

, so I can't say what species were considered there and whether there was something about N. caeruleocarpus.

In general, if N. caeruleocarpus is a complex of similar species, then they probably can't be distinguished from the photo, at least you need to look at the files. So you can safely sign it as N. caeruleocarpus, hardly anyone will refute this.