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Post by nomihoudai on May 14, 2013 7:35:44 GMT -8
I just realised that I confused P. polonus with P. cormion which is much more difficult to find as far as I remember. Nevertheless good luck with your search, I wish I could join the search but I will have to study for an examn next month  One day even I will make it to get the 12€ for the book together  (and the 268€ for the other books) Sounds easy to explain by statistics, if both are equally numerous the females will be visited in the same search time by a correct male which is fine. If one species is much more numerous we can attribute a % of success to a males courtship. The species gap between both species probably has put a number x of success and the courtship with the other species has the value x*d where d<<1, if we have now many courtship attempts by the wrong species we get x*d*a where a is attempts, if a>1/d we get polonus  Or something along these lines... |
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Post by lepidofrance on May 15, 2013 0:31:35 GMT -8
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pips
Junior Member
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Post by pips on May 20, 2013 6:05:26 GMT -8
I do not know if this is a polonus male. It was caught in France in the Meuse region around late july. In this place both coridon and bellargus fly but bellargus in very low numbers in summer (some larger numbers in spring). Coridon flies in very large numbers so this could be ideal for hybrids. Do the hybrids normally fly is spring or also in summer? I hope somebody can help me... Attachments:
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pips
Junior Member
Posts: 44
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Post by pips on May 20, 2013 6:08:33 GMT -8
Another picture to compare it with a typical coridon from the same place. Any ideas are welcome... Attachments:
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Post by nomihoudai on May 20, 2013 6:26:02 GMT -8
Can you show the underside of the specimen? bellargus and coridon are best to be identified by the underside spots and intermediate characters would confirm a polonus. Although I must agree that it has a very bellargus like wing shape already.
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Post by wollastoni on May 20, 2013 7:35:38 GMT -8
From what I have read polonus flies in june. Look like coridon to me.
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pips
Junior Member
Posts: 44
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Post by pips on May 20, 2013 10:29:25 GMT -8
These are all normal upperside coridons with different variations on the underside. They were all caught on the same day as the "special" coridon. Attachments:
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pips
Junior Member
Posts: 44
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Post by pips on May 20, 2013 10:36:38 GMT -8
This is the special form from the underside. Not that much difference to be noted... But when you look at the overall appearance, wingshape, smaller size, more intens blue colouration, black spot in frontwing I would not be 100% shure to rule out the possibility of a hybrid. Why would a hybrid fly in between both flightperiods? Bellargus flies in may and then again in july-august, coridon also in july-august. Hybrids is june may be possible but look a bit strange to me... Attachments:
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pips
Junior Member
Posts: 44
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Post by pips on May 20, 2013 10:41:22 GMT -8
This is a picture I found of a polonus hybrid. Undersides are very similar to coridon. On that website there was also stated that hybrids can be intermediate between the 2 species or be more similar to one of the 2 species. If someone has any more pictures please let us know... Attachments:
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Post by nomihoudai on May 20, 2013 11:10:06 GMT -8
First of all, these specimen are beautiful! They are completely different to my series from Switzerland.
Seeing the underside I do not think that it is polonus, but I may be wrong. My best guess is that the odd wing shape is a result from the fact that this coridon is a form with black patch in the postdiscal region at the upper limit of the discal cell.
I have had no time yet to checkout the large populatins of coridon within Luxembourg but I hope they will be as beautiful as these specimen here. I have started to study the underside patterns in the "Lysandra" group since a few months. I can be wrong but currently my best guess is that this specimen is an odd coridon.
...and yes, polonus is intermediate of coridon and bellargus, a few years ago someone showed a polonus from Spain on insectnet that was closer to bellargus than coridon and had a bellargus like blue coloration of the dorsal side. I also know the source of the picture you showed, it is from a thread in lepiforum in German.
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Post by wollastoni on May 20, 2013 11:15:23 GMT -8
pips < your top right specimen in the picture with the 4 coridon is the beautiful "form arcuata".
In this great article, authors explain that polonus emerge in early June (like bellargus).
Les hybrides entre les Polyommatus (Lysandra) de France (polonus : bellargus x coridon et petri : bellargus x hispanus) (Lepidoptera : Lycaenidae) (Yvan DIRINGER et Christian CASTELAIN)
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One day even I will make it to get the 12€ for the book together 
(and the 268€ for the other books)
Or something along these lines...
