Phimenes flavopictum (?) from Sri Lanka

Phimenes flavopictum (?) from Sri Lanka

Postby pderennes on 30 Apr 2017, 11:29

Hello,

On march 30th 2017, in a garden, Habaraduwa (south west coast), Sri Lanka, I shot this Eumeninae at its nest.

I previously thought about a Delta sp. and on a french forum discussion led to Phimenes flavopictum ... Is that right ? Or may be Phimenes sp. ?


Thanks in advance !!
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P1060257_DxO_bis1024.jpg
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby Montanus on 30 Apr 2017, 19:23

You should check this publication:

van der Vecht - 1959 - On Eumenes arcuatus (Fabricius) and some allied Indo-Australian wasps (Hymenoptera, Vespidae)
http://repository.naturalis.nl/record/317827
van der Vecht used the name Eumenes flavopictus

regards
Øistein
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby pderennes on 01 May 2017, 09:31

Well,

Thank you very much for this paper !! :D :D

I tried to follow the female key, and I leave E. incola (size, shape and localization) to path 2 which leads to path 7: Thorax with several yellow :arrow: 31

31. Gaster with yellow :arrow: 32
32. Markings of mesoscutum lyre-shaped, consisting of two complete hooks. :arrow: 33

Am I right in seeing those markings in this picture :

P1060257_DxO_bis1024cle.jpg


If so,

33. Markings of thorax yellow. :arrow: 34
34. Anterior margin of clypeus shallowly emarginate (fig. 4, no. 18). Body
very extensively marked with yellow (see fig. 7). — India; Ceylon :arrow: flavopictus flavopictus

Can't see the margin of clypeus but could be Eumenes flavopictus flavopictus :?: :?:


What do you think about these guess :?:
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby Montanus on 01 May 2017, 18:04

I am not an expert on this group, but what you write makes sense. However there is a problem with photos because you cannot study the specimen from all angles.

Four species, including Phimenes flavopictus, exhibit some kind of Müllerian mimicry so that similar patterned species in different genera occur in the same geographical area.
See this doctoral thesis, figure 274, to understand more of this:
http://ir.lib.ibaraki.ac.jp/bitstream/10109/12657/2/12101B62.pdf

For this reason it is often necessary to study morphological details instead of relying on colour pattern.

Øistein
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby pderennes on 02 May 2017, 19:17

Oh, Thank you very very much for this link to figure 274 and this doctoral thesis !!! :D :D

I can see structural differences between those four wasps : the gastre is thiner than the others and is widening more progressively in Phimenes flavopictus ... :roll: but ...

BUT you're right : without specimen in hand and all the criterias of a key (clypeus, etc.) matching ... It's gonna be hard ...

Again, thank you very much !! :D

So shall it remains "Eumeninae" ?
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby Montanus on 02 May 2017, 22:00

For me it is a eumenine, but hopefully an expert can tell the genus from your photo.

Øistein
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby pderennes on 05 May 2017, 17:52

Thanks a lot !! :wink:
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby Andricus on 05 May 2017, 20:19

This is Phimenes flavopictus for sure :wink:
Marco Selis
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Re: Phimenes flavopictum (?) from Sri Lanka

Postby pderennes on 07 May 2017, 08:16

Thank you very much !! :D
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