Chrysis ignita group? possible C. terminata!

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Chrysis ignita group? possible C. terminata!

Postby pietsje » 16 Nov 2022 22:15

I saw this Chrysis 12-11-2022, rather late in the year. Location The Netherlands, southern part. Checking a wooden pole.
Pics are probably not good enough but maybe there is a slight possibility to give a more accurate id?
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Last edited by pietsje on 23 Dec 2022 02:15, edited 2 times in total.
Kind regards,
Petra Fleurbaaij

Observations The Netherlands: https://waarneming.nl/users/50326/photos/?advanced=on
and abroad: https://observation.org/users/50326/photos/?
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pietsje
 
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Location: The Netherlands, Tilburg, Southern part of The Netherlands
Name: Petra Fleurbaaij

Re: Chrysis ignita group?

Postby Alex » 21 Dec 2022 20:26

that late I would assume it's a C. terminata, the colours seem to fit, the head and thorax are a quite even blue-teal colour, while the abdomen has some shades of magenta
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Re: Chrysis ignita group?

Postby pietsje » 23 Dec 2022 02:10

Ah thank you Alex, I've never seen this species. And indeed, rather late and so totally unexpected (to see sny gold wasp in the Netherlands in this time of year).

Although.... the information on www.waarneming.nl puzzles me. But I don't know if it's correct. Very late (medio November) vs 'remarkably early' is contracdictory. A possible explanation is more than 1 generation in a year (but that means automatically that the host has also possibly 2 generations in a year).
Unfortunately the pics are insufficient to id it proparly I presume.

About Chrysis terminata:

"Recognition: A medium-sized gold wasp from the ignita group. Chrysis terminata is relatively easy to recognize within the ignita group by the four distinct nodules/small bumps on the forehead ridge. Furthermore, the teeth on the anal edge of the abdomen are quite sharp and the thorax and head dorsally have white hair.

Distribution in the Netherlands: Unclear. Since the host is fairly common, there is a good chance that C. terminata is also fairly common in our country.

Lifestyle: The species parasitizes the wall wasp Ancistrocerus nigricornis. C. terminata flies remarkably early in the year, the species can even be found in late February. It is therefore plausible that all observations of Chrysis ignita s.l. between January and the end of April all concern C. terminata.
Kind regards,
Petra Fleurbaaij

Observations The Netherlands: https://waarneming.nl/users/50326/photos/?advanced=on
and abroad: https://observation.org/users/50326/photos/?
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pietsje
 
Posts: 139
Joined: 23 Jan 2011 00:41
Location: The Netherlands, Tilburg, Southern part of The Netherlands
Name: Petra Fleurbaaij

Re: Chrysis ignita group? possible C. terminata!

Postby Alex » 25 Dec 2022 01:50

Yes, it is a very early spring species - the females parasitise the equally early Ancistrocerus nigricornis in spring. However, males and females hatch from these nests in late summer/autumn, mate and the females overwinter as mated imagines (as opposed to almost all chrysidids and other aculeates that overwinter as pre-pupae). It's perhaps quicker to do the mating in autumn, and so the females can spend their time in spring looking for hosts only.
It's similar to many Halictidae like Lasioglossum and Sphecodes where males are seen late in summer.
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Re: Chrysis ignita group? possible C. terminata!

Postby pietsje » 31 Dec 2022 13:47

Ah Alex, thank you for the clear explanation, that explains a lot about the biology of this species. Very interesting!
Kind regards,
Petra Fleurbaaij

Observations The Netherlands: https://waarneming.nl/users/50326/photos/?advanced=on
and abroad: https://observation.org/users/50326/photos/?
User avatar
pietsje
 
Posts: 139
Joined: 23 Jan 2011 00:41
Location: The Netherlands, Tilburg, Southern part of The Netherlands
Name: Petra Fleurbaaij


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