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Pierre
Member Rosenbergia
Switzerland
1778 Posts |
 Posted - 10/01/2010 : 22:42:16
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Cameroon, 22 mm
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Francesco
Forum Admin
Luxembourg
9552 Posts |
Posted - 14/01/2010 : 15:44:06
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This seems to me a Cloniophorus, but I am not sure and I need some news.
1) Is the apical spine of the first antennal joint acutely pointed (Cloniophorus) or angulated (Chromacilla)?
2) Is the prothorax anteriorly regularly convergent (Cloniophorus) or makes it a very distinct angle (Chromacilla)? |
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Pierre
Member Rosenbergia
Switzerland
1778 Posts |
Posted - 19/01/2010 : 20:31:45
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It's not very easy to reply as the two characters are not convergent but seem to be contradictory:
The first antennal joint is distinctly spined at its apex (Cloniophorus). But the anterior part of the prothorax show an angulate constriction such as a sort of collar (Chromacilla). |
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Francesco
Forum Admin
Luxembourg
9552 Posts |
Posted - 20/01/2010 : 13:05:10
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Yes... it's not always simple to definite such structures... but today we have a bit of sun in Luxembourg and I can provide a picture of both genera... |
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Pierre
Member Rosenbergia
Switzerland
1778 Posts |
Posted - 20/01/2010 : 22:30:40
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| In this case, Chromacilla. Your photo shows the angulate side of the pronotum which fits quite well my specimen. |
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Francesco
Forum Admin
Luxembourg
9552 Posts |
Posted - 21/01/2010 : 08:16:28
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Perfect: Cloniophorus is excluded.
It might also be Metallichroma.
Could you tell me please if only one bowed uninterrupted ridge or several fine transversal ridges (sometimes interrupted in the middle by a smooth area) is present on the posterior half of the pronotum? |
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Pierre
Member Rosenbergia
Switzerland
1778 Posts |
Posted - 21/01/2010 : 20:23:04
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The structure of the pronotum is as follows: surface smooth, brillant. Fine, sharp, parallel ridges close to the anterior and posterior board, without interruption.
Anterior part of the pronotum occupied with 3 flat weak swellings, one in the middle and two bon each side of the first.
Could this fit to your description? |
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Francesco
Forum Admin
Luxembourg
9552 Posts |
Posted - 05/10/2018 : 10:01:50
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| A mon avis, Metallichroma excellens excellens Aurivillius, 1903... tu l'avais enfin identifiée? |
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Pierre
Member Rosenbergia
Switzerland
1778 Posts |
Posted - 05/10/2018 : 10:43:03
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Ah, mon Dieu, ça date... oui, bien sûr, ça fait longtemps que cette bête est classée sous Metallichroma excellens excellens Aurivillius, 1903.
Metallichroma est facile à reconnaître par son scape pyriforme caractéristique. |
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Camerun: Metallichroma excellens excellens
