Coleoptera identification for closely related, hard-to-distinguish species

Community and Forum → Taxonomy. Classification → Coleoptera identification for closely related, hard-to-distinguish species

RippeR, 02.08.2007 15:04

I got the idea to create such a theme. The fact is that there are so many closely related species that are not easy to distinguish, especially from recently described ones. (this series includes Agapanthia violacea and intermedia, Aegomorphus clavipes and woltilaj, Platycerus carboides and caprea)
Many features of these types were already posted on the site in order to distinguish them, but they remained scattered on numerous topics, and these keys are sometimes very necessary and important, but it is no longer possible to find them.
Therefore, we ask what is interesting and give answers. Collecting data!
First of all, I am interested in those types (as indicated above). I had data for some species, but I already sowed it somewhere, so to speak, I lost it

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12.09.2007 1:07, Fornax13

I have a question on Geotrupidae namely:
Geotrupes stercorarius
Geotrupes stercorosus
Geotrupes vernalis
Geotrupes mutator
Geotrupes spiniger

Trypocopris vernalis (L.) and Anoplotrupes stercorosus (Scr.) differ from the others by two transverse keels on the hind legs. (Real Geotrupes have 3 of them). In Anoplotrupes stercorosus (Scr.), the border on the main pronotum is not interrupted, in Trypocopris vernalis (L.) it is interrupted on the sides. T. vernalis (L.) with smooth nds., usually with a strong blue or green gloss. A. stercorosus (Scr.) is almost black above, usually only along the edges with strong ebb. And you can try real Geotrupes using the keys of G. V. Nikolaev...

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21.09.2007 23:10, Archypus

Two males. The first one is not very well spread out, but this is not the point. Habitually very similar, but the former is somewhat longer-legged. In the photo, this is not very noticeable, but it is obvious on the material (which is why there were doubts). The forehead of the second is really smoother and wider. But that's not all. The color of the antennae does not matter much - it is rather an error in shooting, but the mandibles of the second are noticeably larger. Even in the photo of the first one, they are closed, but you can still see it. And pay attention to the shape of the last segment of the maxillary palps. You can probably see better that way:
picture: IMG_Neb.jpg

I have only two copies of Teberda, and they are identical. Judging by the fees, for Sowing. In the Caucasus from Adygea to C. Ossetia should have one (out of two similar) species-N. jarrigei, described in 1991 and previously mixed with N. nigerrima. But how then is nigerrima itself distributed?

This post was edited by Archypus - 13.10.2007 22: 28

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13.10.2007 22:27, Archypus

Yes, it seems that this story can be put to rest. The image shows two views. The first (from Teberda) - Nebria nigerrima Chaudoir 1846, the second - N. jarrigei Ledoux et Roux 1991 Differ (Dzanat Prava) in the number of setae on the penultimate part of the labial palps: in nigerrima there are 3, in jarrigei - 2. Other signs are mostly quantitative (such as "more"or"less"), but they also work.
to Ripper. In the Caucasus, there are more than 1.5 dozen species of nebria, in the North-Zap. In the Caucasus, from Adygea to Elbrus, there are about a dozen of them. They belong to the subgenera Eunebria Jannel 1937 and Alpaeus Bonelli 1809 According to the latest revision of the genus (Ledoux et Roux, 2005), all Caucasian Alpaeus are assigned to the subgenus Nebria Latreille 1825. They are mainly characteristic (with rare exceptions) of the subnival belt-they run near the snow border, while Eunebria species live in the forest belt at altitudes of 1000-2000m

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